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Stock-Based Compensation - Summary of Activity Under Stock Option Plan (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Outstanding at beginning period - Options | shares 1,018,149
Options granted | shares 15,000
Options exercised | shares (29,600)
Options canceled, forfeited or expired - Options | shares (5,000)
Outstanding at ending period - Options | shares 998,549
Exercisable at ending period - Options | shares 486,874
Outstanding at beginning period - Wgtd. Avg. Exercise Price | $ / shares $ 40.69
Options granted - Wgtd. Avg. Exercise Price | $ / shares 55.15
Options exercised - Wgtd. Avg. Exercise Price | $ / shares 29.56
Options cancelled, forfeited, or expired - Wgtd. Avg. Exercise Price | $ / shares 41.02
Outstanding at ending period - Wgtd. Avg. Exercise Price | $ / shares 41.24
Exercisable at ending period - Wgtd. Avg. Exercise Price | $ / shares $ 33.47
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years 8 years 9 months 29 days
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years 5 years 6 months 18 days
Outstanding at ending period - Aggregate Intrinsic Value | $ $ 15,767
Exercisable at ending period - Aggregate Intrinsic Value | $ $ 11,471