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Schedule of Rollforward of Non-controlling Interest Balance (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Noncontrolling Interest [Line Items]
Non-controlling interest beginning balance			$ 253,024
Net income attributable to non-controlling interest	$ 18,307	$ 17,091	26,465	$ 24,678
Foreign currency translation adjustment			(4,318)
Distributions to non-controlling interest			(2,178)
Non-controlling interest ending balance	$ 273,548		273,548
Non-controlling Interest
Noncontrolling Interest [Line Items]
Gain recorded in accumulated other comprehensive loss			212
Loss reclassified from accumulated other comprehensive loss into earnings			$ 343