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Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Parenthetical) (Detail)
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6 Months Ended | 3 Months Ended | |||||
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Jun. 30, 2014
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Jun. 30, 2014
Market and performance condition awards [Member]
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Dec. 31, 2013
Market and performance condition awards [Member]
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Jun. 30, 2014
Market condition awards [Member]
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Dec. 31, 2013
Market condition awards [Member]
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Jun. 30, 2014
Performance condition awards [Member]
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Dec. 31, 2013
Performance condition awards [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||
| Outstanding SARs | 900,000 | 900,000 | 1,500,000 | 1,500,000 | 1,000,000 | 400,000 | |
| Exercisable SARs | 1,500,000 | ||||||
| Outstanding awards granted | 1,509,000 | 600,000 |
| X | ||||||||||
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- Definition
Share-based compensation arrangement by share-based payment award options and appreciation rights grants in period. No definition available.
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| X | ||||||||||
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- Definition
The number of exercisable stock appreciation rights (SARs). No definition available.
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| X | ||||||||||
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- Definition
The number of outstanding stock appreciation rights (SARs). No definition available.
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| X | ||||||||||
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- Details
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