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Schedule of Rollforward of Noncontrolling Interest Balance (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Noncontrolling Interest [Line Items]        
Noncontrolling interest beginning balance     $ 286,996  
Net income attributable to noncontrolling interest 22,284 21,264 29,934 28,968
Distributions to noncontrolling interest     (25,817)  
Foreign currency translation adjustment     (307)  
Noncontrolling interest ending balance $ 290,806   $ 290,806