Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (9,031)	$ 929
Other comprehensive loss, net of tax:
Interest rate swap	(7,279)	0
Total other comprehensive loss	(7,279)	0
Comprehensive (loss) income	$ (16,310)	$ 929