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Stock Incentive Plan - Additional Information (Detail) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | |||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Aug. 31, 2013
Market-based Restricted Stock Units [Member]
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Aug. 31, 2013
Market-based Restricted Stock Units [Member]
Minimum [Member]
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Aug. 31, 2013
Market-based Restricted Stock Units [Member]
Maximum [Member]
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Dec. 31, 2013
Stock Options [Member]
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Dec. 31, 2013
Restricted Stock Units [Member]
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Dec. 31, 2013
Restricted Stock Units [Member]
Service Based Restricted Stock Units [Member]
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Dec. 31, 2013
Restricted Stock Units [Member]
Market-based Restricted Stock Units [Member]
Minimum [Member]
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Dec. 31, 2013
Restricted Stock Units [Member]
Market-based Restricted Stock Units [Member]
Maximum [Member]
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Dec. 31, 2013
Time Based Restricted Stock Units [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||
| Period of options vested | 4 years | 3 years | 2 years | 3 years | ||||||||
| Period of expiration | 10 years | |||||||||||
| Increase in shares available to grant | 1,400,000 | |||||||||||
| Shares available for grant | 1,649,831 | |||||||||||
| Cash received from stock option exercised | $ 3,798,000 | $ 2,682,000 | $ 6,207,000 | |||||||||
| Requisite service period of compensation expense | 4 years | 2 years | 3 years | |||||||||
| Fair value of common stock | $ 33.55 | |||||||||||
| Weighted average grant date fair value | $ 11.60 | $ 18.57 | $ 22.42 | |||||||||
| Number of restricted stock units, granted | 74,000 | 837,000 | 763,073 | |||||||||
| Total shareholder return target share, percentage | 0.00% | 200.00% | ||||||||||
| Total shareholder return target share | 148,000 | |||||||||||
| Unrecognized share-based compensation cost | $ 36,656,000 | |||||||||||
| Share-based compensation cost not yet recognized period for recognition | 2 years | |||||||||||