Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Consolidated net income (loss)	$ 2,560	$ 162,304	$ 111,499	$ 309,725
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(8,241)	(1,809)	(10,476)	(10,186)
Total other comprehensive income (loss), net of tax	(8,241)	(1,809)	(10,476)	(10,186)
Comprehensive income (loss)	(5,681)	160,495	101,023	299,539
Comprehensive income (loss) from continuing operations attributable to noncontrolling interest in subsidiaries, net of tax	5,110	8,327	38,260	47,577
Comprehensive income (loss) from discontinued operations attributable to noncontrolling interest in subsidiaries, net of tax		34,062		46,474
Less: Total comprehensive income (loss) attributable to noncontrolling interest in subsidiaries, net of tax	5,110	42,389	38,260	94,051
Comprehensive income (loss) attributable to common stockholders	$ (10,791)	$ 118,106	$ 62,763	$ 205,488