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Equity-Based Compensation - Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Options outstanding, Beginning balance 1,199,540 974,566 1,000,946  
Options granted 605,200 374,700 259,300  
Options exercised (55,671) (20,989) (87,367)  
Options cancelled (389,001) (128,737) (198,313)  
Options outstanding, Ending balance 1,360,068 1,199,540 974,566 1,000,946
Options exercisable, Ending balance 513,290 534,164    
Options outstanding, Weighted Average Exercise Price, Beginning balance $ 44.64 $ 47.89 $ 48.42  
Options granted, Weighted Average Exercise Price 28.50 37.54 42.25  
Options exercised, Weighted Average Exercise Price 19.05 17.83 25.92  
Options cancelled, Weighted Average Exercise Price 40.84 50.83 54.71  
Options outstanding, Weighted Average Exercise Price, Ending balance 39.40 44.64 $ 47.89 $ 48.42
Options exercisable, Weighted Average Exercise Price, Ending balance $ 48.08 $ 44.98    
Options outstanding, Weighted Average Remaining Contractual Term 7 years 6 months 25 days 7 years 3 months 3 days 7 years 5 months 15 days 7 years 5 months 15 days
Options granted, Weighted Average Remaining Contractual Term 9 years 2 months 15 days 9 years 2 months 15 days 9 years 3 months 18 days  
Options exercisable, Weighted Average Remaining Contractual Term, Ending balance 5 years 10 months 17 days 5 years 8 months 23 days    
Options outstanding, Aggregate Intrinsic Value $ 1,650 $ 2,717 $ 3,802 $ 8,166
Options granted, Aggregate Intrinsic Value 1,343 246 205  
Options exercised, Aggregate Intrinsic Value 658 383 1,636  
Options cancelled, Aggregate Intrinsic Value 0 0 $ 0  
Options exercisable, Aggregate Intrinsic Value, Ending balance $ 512 $ 2,386