Noncontrolling Interests - Components of Net Loss Attributable to Noncontrolling Interests (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Noncontrolling Interest [Line Items]
Net Loss Attributable to Noncontrolling Interests	$ (41,860)	$ (7,984)	$ (67,945)	$ (15,218)
Group A Units
Noncontrolling Interest [Line Items]
Net Loss Attributable to Noncontrolling Interests	(42,130)	(8,148)	(67,467)	(15,517)
Other
Noncontrolling Interest [Line Items]
Net Loss Attributable to Noncontrolling Interests	$ 270	$ 164	$ (478)	$ 299