Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 7,002	$ (35,592)
Other comprehensive income (loss), net of tax:
Change in foreign currency translation	407	(166)
Change in fair value of available for sale securities	(69)	(223)
Total other comprehensive income (loss)	338	(389)
Comprehensive income (loss)	7,340	(35,981)
Comprehensive (income) loss attributable to redeemable noncontrolling interests	(1,573)
Comprehensive income (loss) attributable to common stockholders	$ 5,767	$ (35,981)