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Equity-Based Compensation - Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Options outstanding, Beginning balance 1,360,068 1,199,540 974,566  
Options granted 507,600 605,200 374,700  
Options exercised (68,700) (55,671) (20,989)  
Options cancelled (288,662) (389,001) (128,737)  
Options outstanding, Ending balance 1,510,306 1,360,068 1,199,540 974,566
Options exercisable, Ending balance 596,606 513,290    
Options outstanding, Weighted Average Exercise Price, Beginning balance $ 39.40 $ 44.64 $ 47.89  
Options granted, Weighted Average Exercise Price 33.13 28.50 37.54  
Options exercised, Weighted Average Exercise Price 29.15 19.05 17.83  
Options cancelled, Weighted Average Exercise Price 39.67 40.84 50.83  
Options outstanding, Weighted Average Exercise Price, Ending balance 37.56 39.40 $ 44.64 $ 47.89
Options exercisable, Weighted Average Exercise Price, Ending balance $ 45.37 $ 48.08    
Options outstanding, Weighted Average Remaining Contractual Term 7 years 4 months 6 days 7 years 6 months 25 days 7 years 3 months 3 days 7 years 5 months 15 days
Options granted, Weighted Average Remaining Contractual Term 9 years 2 months 4 days 9 years 2 months 15 days 9 years 2 months 15 days  
Options exercisable, Weighted Average Remaining Contractual Term, Ending balance 5 years 6 months 18 days 5 years 10 months 17 days    
Options outstanding, Aggregate Intrinsic Value $ 1,414 $ 1,650 $ 2,717 $ 3,802
Options granted, Aggregate Intrinsic Value 157 1,343 246  
Options exercised, Aggregate Intrinsic Value 854 658 383  
Options cancelled, Aggregate Intrinsic Value 0 0 $ 0  
Options exercisable, Aggregate Intrinsic Value, Ending balance $ 543 $ 512