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Share-Based Compensation - Additional Information (Detail) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||
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Dec. 31, 2013
Plans
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
Independent Director Stock Units [Member]
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Feb. 28, 2009
Chairman and Chief Executive Officer [Member]
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Mar. 31, 2008
Chairman and Chief Executive Officer [Member]
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Dec. 31, 2013
Performance conditions [Member]
June 2014 [Member]
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Dec. 31, 2013
Performance conditions [Member]
June 2015 [Member]
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Dec. 31, 2013
Performance conditions [Member]
June 2016 [Member]
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Dec. 31, 2013
Management Plan [Member]
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Dec. 31, 2013
2004 Stock Incentive Plan [Member]
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Dec. 31, 2013
Incentive Plan Stock Units [Member]
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Dec. 31, 2013
SARs [Member]
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Dec. 31, 2013
SARs [Member]
Incentive Plan Stock Units Other [Member]
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Dec. 31, 2013
Stock Options [Member]
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Dec. 31, 2013
Stock Units [Member]
Independent Director Stock Units [Member]
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Mar. 31, 2008
Stock Units [Member]
Chairman and Chief Executive Officer [Member]
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Mar. 31, 2008
Market Condition 1 [Member]
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Mar. 31, 2008
Market Condition Target 2 [Member]
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Dec. 31, 2013
Service condition awards [Member]
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Dec. 31, 2012
Service condition awards [Member]
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Dec. 31, 2011
Service condition awards [Member]
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Dec. 31, 2013
Market and performance condition awards [Member]
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Dec. 31, 2012
Market and performance condition awards [Member]
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Dec. 31, 2011
Market and performance condition awards [Member]
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Dec. 31, 2013
Performance condition awards [Member]
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Dec. 31, 2012
Performance condition awards [Member]
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Dec. 31, 2011
Performance condition awards [Member]
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Dec. 31, 2013
Market condition awards [Member]
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Dec. 31, 2012
Market condition awards [Member]
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Dec. 31, 2011
Market condition awards [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||||||||||
| Number of share-based compensation plan | 5 | ||||||||||||||||||||||||||||||
| Additional awards | 0 | 0 | 0 | ||||||||||||||||||||||||||||
| Common shares authorized under 2005 Stock Incentive Plan | 14,400,000 | ||||||||||||||||||||||||||||||
| Common shares remain for future issuance under share-based compensation plans | 1,900,000 | ||||||||||||||||||||||||||||||
| Contractual term | 3 years | 10 years | 10 years | ||||||||||||||||||||||||||||
| Vesting period beginning from the grant date | 3 years | 5 years | 3 years | 5 years | 4 years | ||||||||||||||||||||||||||
| Stock units vesting rate | 25.00% | ||||||||||||||||||||||||||||||
| Stock units vesting rate during first three years | 30.00% | ||||||||||||||||||||||||||||||
| Stock units vesting rate during fourth year | 10.00% | ||||||||||||||||||||||||||||||
| Granted stock unit awards to Chairman and Chief Executive Officer vesting | The Company granted stock units and SARs to certain employees subject to continued service, one-third of which vest on the third anniversary of the date of grant, one-third of which vest on the fourth anniversary of the date of grant, and the remaining one-third of which vest on the fifth anniversary of the date of grant. | Over a four-year period at a rate of 30% during each of the first three years and 10% during the fourth year | |||||||||||||||||||||||||||||
| Stock price appreciation rate | 10.00% | 15.00% | |||||||||||||||||||||||||||||
| Awards vest, percentage | 20.00% | 20.00% | 60.00% | ||||||||||||||||||||||||||||
| Share-based compensation expense | $ 24,600,000 | $ 22,700,000 | $ 19,200,000 | $ 4,500,000 | $ 4,600,000 | $ 1,400,000 | $ 300,000 | $ 0 | $ 700,000 | $ 2,900,000 | |||||||||||||||||||||
| Realized income tax benefit for all awards | 10,400,000 | 9,500,000 | 7,500,000 | ||||||||||||||||||||||||||||
| Unrecognized compensation cost on non-vested stock awards | 41,600,000 | 4,500,000 | 12,700,000 | ||||||||||||||||||||||||||||
| Unrecognized compensation cost on non-vested stock awards, weighted-average period of recognition | 1 year 4 months 24 days | 1 year | 1 year 8 months 12 days | ||||||||||||||||||||||||||||
| Excess tax benefit | 15,566,000 | 29,684,000 | 26,241,000 | ||||||||||||||||||||||||||||
| Awards granted | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||||||||
| Total intrinsic value of awards exercised for options and SARs | 16,100,000 | 98,600,000 | 133,800,000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||||
| Weighted-average grant date fair value of SARs granted | $ 30.57 | $ 15.36 | $ 21.23 | $ 17.37 | $ 33.04 | ||||||||||||||||||||||||||
| Total vesting date fair value of stock units | $ 7,300,000 | $ 24,300,000 | $ 19,800,000 | ||||||||||||||||||||||||||||
| Percent of fair market value for which eligible employees can purchase common shares under employee stock purchase plan | 85.00% | ||||||||||||||||||||||||||||||
| Reserved for issuance under employee stock purchase plan | 2,000,000 | ||||||||||||||||||||||||||||||
| Future Issuance of employee stock purchase plan | 1,800,000 | ||||||||||||||||||||||||||||||