Stock-Based Compensation - Details of Nonvested Restricted Stock Units Activity (Detail) - Restricted stock units - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Beginning Balance (in shares)	240,991
Granted (in shares)	120,001
Vested (in shares)	(91,237)
Canceled (in shares)	(42,667)
Accrued dividend equivalents (in shares)	3,874
Ending Balance (in shares)	230,962	240,991
Vested but not released (in shares)	1,483	1,460
Outstanding (in shares)	232,445
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning Balance (in dollars per share)	$ 35.69
Granted (in dollars per share)	32.52	$ 34.53	$ 38.33
Vested (in dollars per share)	36.56
Canceled (in dollars per share)	36.90
Accrued dividend equivalents (in dollars per share)	34.07
Ending Balance (in dollars per share)	33.49	35.69
Vested but not released (in dollars per share)	18.04
Outstanding (in dollars per share)	$ 33.39
Aggregate intrinsic value of shares outstanding	$ 7,761
Weighted-average remaining contractual term of shares outstanding	21 months
Granted (in dollars per share)	$ 32.52	$ 34.53	$ 38.33
Weighted average grant-date fair value of shares vested	$ 3,336	$ 3,000	$ 5,627