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Significant Accounting Policies - Effects of Prior Period Errors in Condensed Consolidated Statements of Income (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Income taxes | $ 45,464 | $ 45,424 | $ 133,775 | $ 141,811 | $ 186,944 | $ 144,820 | $ 87,212 |
| Net income | 141,950 | 111,873 | 403,985 | 351,755 | 463,962 | 414,959 | 292,883 |
| Basic earnings per share | $ 1.39 | $ 1.03 | $ 3.92 | $ 3.09 | $ 4.13 | $ 3.53 | $ 2.46 |
| Diluted earnings per share | $ 1.32 | $ 0.98 | $ 3.75 | $ 2.95 | $ 3.94 | $ 3.32 | $ 2.32 |
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As Previously Reported [Member]
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| Income taxes | 39,518 | 134,257 | 173,716 | 147,201 | 80,880 | ||
| Net income | $ 117,779 | $ 359,309 | $ 477,190 | $ 412,578 | $ 299,215 | ||
| Basic earnings per share | $ 1.08 | $ 3.16 | $ 4.25 | $ 3.51 | $ 2.51 | ||
| Diluted earnings per share | $ 1.04 | $ 3.01 | $ 4.05 | $ 3.30 | $ 2.37 | ||
| X | ||||||||||
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- Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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