Equity-Based Compensation - Schedule of Equity Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	$ 1,162	$ 5,183	$ 8,444	$ 18,620
Operating Expense [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	654	2,119	2,687	6,350
Selling, General and Administrative Expenses [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation	$ 508	$ 3,064	$ 5,757	$ 12,270