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Stock-Based Compensation - SAR Activity (Detail) - Stock Appreciation Rights [Member] - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Stock Appreciation Rights Activity [Line Items]      
SARs Outstanding, Beginning Balance 304,038 476,952 556,232
Granted, SARs 43,830 49,072 42,520
Exercised, SARs (54,592) (217,528) (121,800)
Canceled, SARs (4,458)
Shares Outstanding, SARs, Ending Balance 293,276 304,038 476,952
Outstanding, Weighted Average Grant Price Per Share, Beginning Balance $ 15.79 $ 9.63 $ 6.73
Vested, SARs 237,323    
Granted, Weighted Average Grant Price Per Share $ 50.39 38.85 28.30
Exercisable, SARs 237,323    
Exercised, Weighted Average Grant Price Per Share $ 9.41 6.95 2.64
Canceled, Weighted Average Grant Price Per Share 38.85
Outstanding, Weighted Average Grant Price Per Share, Ending Balance 22.15 $ 15.79 $ 9.63
Vested, Weighted Average Grant Price Per Share 17.05    
Exercisable, Weighted Average Grant Price Per Share $ 17.05    
Weighted Average Remaining Contractual Life, Outstanding 5 years 4 months 24 days    
Weighted Average Remaining Contractual Life, Vested 4 years 8 months 12 days    
Weighted Average Remaining Contractual Life, Exercisable 4 years 8 months 12 days    
Aggregate Intrinsic Value, Outstanding $ 18,058,138    
Aggregate Intrinsic Value, Vested 15,821,712    
Aggregate Intrinsic Value, Exercisable $ 15,821,712