Income Taxes - Schedule of Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
U.S. Federal:
Current	$ 0	$ 0	$ 0
Deferred	(21,061)	(57,637)	(5,488)
U. S. Federal Income Tax Expense (Benefit)	(21,061)	(57,637)	(5,488)
U.S. State:
Current	392	199	427
Deferred	(2,058)	(717)	3,218
State and Local Income Tax Expense (Benefit)	(1,666)	(518)	3,645
Foreign Income Tax Expense (Benefit), Continuing Operations [Abstract]
Foreign	2,371	108	1,374
Deferred	(5,590)	(926)	0
Foreign Income Tax Expense (Benefit)	(3,219)	(818)	1,374
Total	$ (25,946)	$ (58,973)	$ (469)