Summary of Significant Accounting Policies - Calculation of Basic and Diluted Earnings (Loss) Per Share (Detail) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) $ / shares shares
Accounting Policies [Abstract]
Net Income (Loss) | $		$ (15,805)	$ 11,114	$ (1,099,072)	$ (87,025)
Basic weighted-average common shares outstanding in period (in shares)	[1]	4,246,047	4,210,993	4,235,432	4,205,768
Add dilutive effects of stock options and nonvested equity shares of common stock (in shares)		0	8,000	0	0
Diluted weighted-average common shares outstanding in period (in shares)	[1]	4,246,047	4,218,745	4,235,432	4,205,768
Basic net income (loss) per common share (in dollars per share) | $ / shares	[1]	$ (3.72)	$ 2.64	$ (259.52)	$ (20.69)
Diluted net income (loss) per common share (in dollars per share) | $ / shares	[1]	$ (3.72)	$ 2.63	$ (259.52)	$ (20.69)
Reverse stock split ratio				0.02
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount			62,142

[1] All share and per share information has been retroactively adjusted to reflect a 1-for-50 reverse stock split effective October 30, 2020. See Note 12 for additional information.