Earnings per Share - Reconciliation of Net Income (Loss) and Number of Common Shares Used in Computations of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator - Basic and Diluted
Net loss	$ (10,933)	$ (30,975)
Net loss attributable to non-controlling interests	3,213	10,311
Preferred dividends	(1,225)	(1,225)
Net loss attributable to common shareholders - Basic and diluted	$ (8,945)	$ (21,889)
Denominator - Basic and Diluted
Weighted average common shares outstanding	39,477	37,232
Weighted average Class A and Class C common shares outstanding - Diluted	39,477	37,232
Net loss per share attributable to Class A and Class C common shareholders - Basic	$ (0.23)	$ (0.59)
Net loss per share attributable to Class A and Class C common shareholders - Diluted	$ (0.23)	$ (0.59)
Class A Common Shares [Member]
Denominator - Basic and Diluted
Weighted average common shares outstanding	39,477	37,232