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Earnings per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income	$ 8,190	$ 5,947	$ 8,714	$ 486	$ 4,216	$ 100,423	$ 11,526	$ (612)	$ 23,337	$ 115,553	$ 25,208
Denominator:
Weighted average shares outstanding, basic (in shares)									54,427,683	53,137,562	50,859,947
Effect of dilutive securities (in shares)									763,119	1,709,498	2,185,310
Weighted average shares outstanding, diluted (in shares)									55,190,802	54,847,060	53,045,257
Net income per share, basic and diluted:
Basic (in dollars per share)	$ 0.15	$ 0.11	$ 0.16	$ 0.01	$ 0.08	$ 1.88	$ 0.22	$ (0.01)	$ 0.43	$ 2.17	$ 0.50
Diluted (in dollars per share)	$ 0.15	$ 0.11	$ 0.16	$ 0.01	$ 0.08	$ 1.84	$ 0.21	$ (0.01)	$ 0.42	$ 2.11	$ 0.48
Antidilutive securities excluded from calculations of diluted net income per share (in shares)									3,407,409	1,932,024	903,265

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