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Summary of Significant Accounting Policies - Computations of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income	$ 13,078	$ 4,398	$ (3,258)	$ 8,096	$ 4,121	$ (2,119)	$ 14,218	$ 10,098
Weighted-average shares of common stock outstanding:
Basic	61,726			61,208			61,656	61,059
Dilutive effect of stock options, restricted stock, and performance stock units	417			1,398			516	1,480
Diluted	62,143			62,606			62,172	62,539
Basic	$ 0.21			$ 0.13			$ 0.23	$ 0.17
Diluted	$ 0.21			$ 0.13			$ 0.23	$ 0.16

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