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Schedule of Rollforward of Non-controlling Interest Balance (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Noncontrolling Interest [Line Items]
Non-controlling interest beginning balance			$ 248,079
Net income attributable to non-controlling interest	$ 16,676	$ 16,670	43,746	$ 46,604
Distributions to non-controlling interest			(13,266)
Foreign currency translation adjustment			(12,732)
Non-controlling interest ending balance	$ 266,203		266,203
Noncontrolling Interest
Noncontrolling Interest [Line Items]
Gain recorded in accumulated other comprehensive loss			933
Gain reclassified from accumulated other comprehensive loss into earnings			$ (557)