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Share Based Compensation - Summarized Activity of Stock Option Awards (Detail) (Stock Options [Member], USD $)
3 Months Ended
Mar. 31, 2013
Stock Options [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Balance at beginning of year, Options Outstanding 1,756,000
Granted, Options Outstanding 373,000
Exercised, Options Outstanding (37,000)
Forfeited, Options Outstanding (5,000)
Balance at end of period, Options Outstanding 2,087,000
Exercisable at end of period, Options Outstanding 1,196,000
Balance at beginning of year, Weighted Average Exercise Price $ 20.53
Granted, Weighted Average Exercise Price $ 18.70
Exercised, Weighted Average Exercise Price $ 14.07
Forfeited, Weighted Average Exercise Price $ 17.01
Balance at end of period, Weighted Average Exercise Price $ 20.32
Exercisable at end of period, Weighted Average Exercise Price $ 22.37
Weighted Average Remaining Contractual Term 7 years
Weighted Average Remaining Contractual Term 7 years
Exercisable at end of period, Weighted Average Remaining Contractual Term 6 years
Balance at beginning of period, Aggregate Intrinsic Value $ 1,956,000
Balance at end of period, Aggregate Intrinsic Value 7,497,000
Exercisable at end of period, Aggregate Intrinsic Value $ 3,688,000