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Earnings Per Share - Calculations of Net Income (Loss) Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share And Equity [Abstract]
Net income (loss)	$ (42,783)	$ (14,274)	$ 5,689	$ 14,118	$ (57,057)	$ 19,807
Basic weighted average common shares outstanding	36,048,000		35,628,000		36,005,000	35,579,000
Add: Incremental shares for:
Dilutive effect of warrants			3,038			2,183
Dilutive effect of restricted stock			766			620
Diluted weighted average common shares outstanding	36,048,000		39,432,000		36,005,000	38,382,000
Net income (loss) per share attributable to common shareholders
Basic	$ (1.19)		$ 0.16		$ (1.58)	$ 0.56
Diluted	$ (1.19)		$ 0.14		$ (1.58)	$ 0.52

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