Other Financial Information - Summary of Other Comprehensive Income (Loss) Included in Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ 2,050,946	$ 1,632,532	$ 1,587,282	$ 664,392	$ 355,426
Accumulated other comprehensive loss, adjustment attributable to parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(1,112,695)	$ (925,556)	(925,556)	$ (1,052,055)	$ (952,677)
Foreign currency translation loss, adjustment attributable to parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(1,127,719)		(927,221)
Unrealized gains (losses) on derivatives, adjustment attributable to parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	18,366		4,657
Minimum pension liability adjustment, adjustment attributable to parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(3,342)		(2,992)
Accumulated other comprehensive loss, AOCI attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	459		(33)
Foreign currency translation loss, AOCI attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	459		(33)
Unrealized gains (losses) on derivatives, AOCI attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	0		0
Minimum pension liability adjustment, AOCI attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	0		0
AOCI including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(1,112,236)		(925,589)
Foreign currency translation loss, AOCI including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(1,127,260)		(927,254)
Unrealized gains (losses) on derivatives, AOCI including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	18,366		4,657
Minimum pension liability adjustment, AOCI including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (3,342)		$ (2,992)