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Stock-Based Compensation - Summary of Activity Under Stock Option Plan (Detail) - Jun. 30, 2015 - USD ($)
$ / shares in Units, $ in Thousands
Total
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Outstanding at beginning period - Options 1,029,657
Options granted 98,000
Options exercised (57,250)
Options canceled, forfeited or expired - Options (22,500)
Outstanding at ending period - Options 1,047,907
Exercisable at ending period - Options 475,682
Outstanding at beginning period - Wgtd. Avg. Exercise Price $ 36.55
Options granted - Wgtd. Avg. Exercise Price 60.02
Options exercised - Wgtd. Avg. Exercise Price 23.64
Options cancelled, forfeited, or expired - Wgtd. Avg. Exercise Price 37.14
Outstanding at ending period - Wgtd. Avg. Exercise Price 39.44
Exercisable at ending period - Wgtd. Avg. Exercise Price $ 31.54
Outstanding at ending period - Wgtd. Avg. Remaining Contractual Term, years 8 years 10 months 17 days
Exercisable at ending period - Wgtd. Avg. Remaining Contractual Term, years 5 years 2 months 16 days
Outstanding at ending period - Aggregate Intrinsic Value $ 27,260
Exercisable at ending period - Aggregate Intrinsic Value $ 16,131