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Stock-Based Compensation - Summary of Activity Under Stock Option Plan (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Outstanding at beginning period - Options 1,158,317
Options granted 10,000
Options exercised (63,625)
Options canceled, forfeited or expired - Options   
Outstanding at ending period - Options 1,104,692
Exercisable at ending period - Options 516,042
Outstanding at beginning period - Wgtd. Avg. Exercise Price $ 34.45
Options granted - Wgtd. Avg. Exercise Price $ 58.61
Options exercised - Wgtd. Avg. Exercise Price $ 25.80
Options cancelled, forfeited, or expired - Wgtd. Avg. Exercise Price   
Outstanding at ending period - Wgtd. Avg. Exercise Price $ 35.16
Exercisable at ending period - Wgtd. Avg. Exercise Price $ 28.77
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years 8 years 7 months 13 days
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years 4 years 11 months 23 days
Outstanding at ending period - Aggregate Intrinsic Value $ 29,667
Exercisable at ending period - Aggregate Intrinsic Value $ 17,094