Earnings (Loss) Per Share - Schedule of Computation of Basic and Diluted Loss Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic earnings (loss) per share
Income (loss) from continuing operations	$ 8,461	$ (14,244)	$ (10,843)	$ (44,289)
Income (loss) from discontinued operations, net of tax	264,501	12,637	289,227	(963)
Net income (loss)	$ 272,962	$ (1,607)	$ 278,384	$ (45,252)
Basic weighted average common stock outstanding	35,280,864	34,357,745	35,089,479	34,266,513
Basic earnings (loss) per common share
Continuing operations	$ 0.24	$ (0.41)	$ (0.31)	$ (1.29)
Discontinued operations	7.50	0.36	8.24	(0.03)
Total	$ 7.74	$ (0.05)	$ 7.93	$ (1.32)
Diluted earnings (loss) per share
Income (loss) from continuing operations	$ 8,461	$ (14,244)	$ (10,843)	$ (44,289)
Add back: Interest expense on Exchangeable Notes	1,429
Income (loss) from continuing operations allocated to common stockholders	9,890	(14,244)	(10,843)	(44,289)
Income (loss) from discontinued operations, net of tax	264,501	12,637	289,227	(963)
Net income (loss) allocated to common stockholders	$ 274,391	$ (1,607)	$ 278,384	$ (45,252)
Basic weighted average common stock outstanding	35,280,864	34,357,745	35,089,479	34,266,513
Net effect of dilutive equity awards	1,156,769
Net effect of assumed conversion of 5.0% Exchangeable Notes to common stock	10,144,155
Diluted weighted average common stock outstanding	46,581,788	34,357,745	35,089,479	34,266,513
Continuing operations	$ 0.21	$ (0.41)	$ (0.31)	$ (1.29)
Discontinued operations	5.68	0.36	8.24	(0.03)
Total	$ 5.89	$ (0.05)	$ 7.93	$ (1.32)