Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share (EPS) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Basic (loss) earnings per share:
Net (loss) income attributable to common stockholders (000's)	$ (3,950)	$ 4,132	$ (9,097)	$ 11,752
Weighted average shares outstanding	27,904,923	27,876,801	27,866,364	28,212,735
Basic	$ (0.14)	$ 0.15	$ (0.33)	$ 0.42
Diluted (loss) earnings per share:
Net (loss) income attributable to common stockholders (000's)	$ (3,950)	$ 4,132	$ (9,097)	$ 11,752
Weighted average shares outstanding	27,904,923	27,876,801	27,866,364	28,212,735
Weighted average dilutive shares		36,895		18,538
Total weighted average dilutive shares	27,904,923	27,913,696	27,866,364	28,231,273
Diluted	$ (0.14)	$ 0.15	$ (0.33)	$ 0.42