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Schedule of Rollforward of Non-controlling Interest Balance (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Noncontrolling Interest [Line Items]
Non-controlling interest beginning balance			$ 248,079
Net income attributable to non-controlling interest	$ 18,818	$ 22,284	27,070	$ 29,934
Distributions to non-controlling interest			(3,654)
Foreign currency translation adjustment			(6,838)
Non-controlling interest ending balance	$ 264,757		264,757
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Gain recorded in accumulated other comprehensive loss			554
Gain reclassified from accumulated other comprehensive loss into earnings			$ (454)