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Summary of Stock Option Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Number of Shares Outstanding, option  
Number of Shares Outstanding, Beginning Balance 2,546,117
Number of shares, Granted 810,250 [1]
Number of shares, Options exercised (139,192)
Number of shares, Options/SAR units forfeited or expired (65,538)
Number of Shares Outstanding, Ending Balance 3,151,637 [2]
Number of Shares Exercisable, Ending Balance 1,535,800 [3]
Weighted-average exercise price  
Weighted-average exercise price, Beginning Balance $ 15.88
Weighted-average exercise price, Granted $ 16.72 [1]
Weighted-average exercise price, Options exercised $ 8.15
Weighted-average exercise price, Options/SAR units forfeited or expired $ 22.63
Weighted average exercise price, ending balance $ 16.30 [1]
Weighted average exercise price, exercisable $ 14.51 [3]
Weighted-Average Remaining Contractual Term  
Weighted Average Remaining Contractual Life, Outstanding at end of period 5 years [2]
Weighted Average Remaining Contractual Life, Exercisable at end of period 3 years 4 months 24 days [3]
Aggregate Intrinsic Value  
Aggregate Intrinsic Value, Outstanding $ 9,438,131 [2]
Aggregate Intrinsic Value, Exercisable $ 7,871,821 [3]
[1] Included 678,250 SAR units which 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
[2] Due to the ceiling imposed on the SAR grants, the outstanding amount equals a maximum of 2,848,877 shares of the Company's common stock issuable upon exercise.
[3] Due to the ceiling imposed on the SAR grants, the exercisable amount equals a maximum of 1,499,082 shares of the Company's common stock issuable upon exercise