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Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Number of shares outstanding, Option  
Number of shares outstanding, Beginning balance 3,115,972
Number of shares outstanding, Ending balance 3,115,115 [1]
Number of shares exercisable, Ending balance 1,621,181 [2]
Weighted-average exercise price  
Weighted-average exercise price, Beginning balance $ 16.30
Weighted average exercise price, Ending balance $ 16.38 [1]
Weighted average exercise price, exercisable $ 15.12 [2]
Weighted-Average Remaining Contractual Term  
Weighted average remaining contractual life, Outstanding at end of period 4 years 7 months 6 days [1]
Weighted average remaining contractual life, Exercisable at end of period 3 years 1 month 6 days [2]
Aggregate intrinsic value  
Aggregate intrinsic value, Outstanding $ 9,666,701 [1]
Aggregate intrinsic value, Exercisable $ 7,904,791 [2]
Stock Appreciation Rights (SARs)
  
Number of shares outstanding, Option  
Number of shares, SAR units granted 54,500 [3]
Weighted-average exercise price  
Weighted average exercise price, SAR units granted $ 16.99 [3]
Stock Options and SARs [Member]
  
Number of shares outstanding, Option  
Number of shares, Options/SAR units exercised (38,611)
Number of shares, Options/SAR units forfeited or expired (16,746)
Weighted-average exercise price  
Weighted average exercise price, Options/SAR units exercised $ 8.78
Weighted average exercise price, Options/SAR units forfeited or expired $ 20.32
[1] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 2,804,730 shares of the Company's common stock issuable upon exercise.
[2] Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 1,567,775 shares of the Company's common stock issuable upon exercise.
[3] The SAR units are convertible for a maximum number of shares of the Company's common stock equal to 75% of the SAR units subject to the grant.