Income Taxes - Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal tax at statutory rate	$ (100,391)	$ (55,951)	$ (73,849)
State and local tax (expense) benefit	1,000	(4,895)	945
Deferred tax assets generated in current year not benefited	(7,643)	(6,246)	(4,916)
Foreign income tax rate differential	26,151	22,016	30,387
Non-deductible expenses	(2,629)	(15,828)	(14,252)
Stock-based compensation expense	(616)	(5,890)	(3,922)
Change in valuation allowance	(716)	11,995	710
Foreign financing activities	1,319	(26,708)	2,592
Loss on debt extinguishment	(1,604)	(8,288)	0
Gain on divestments	0	8,828	0
Uncertain tax positions reserve	(66)	(9,371)	(3,191)
Tax adjustments related to REIT	41,973	45,060	45,823
Enactment of the US tax reform	(6,513)	0	0
Other, net	(4,115)	(173)	(3,551)
Provision for income taxes	$ (53,850)	$ (45,451)	$ (23,224)