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Schedule of Rollforward of Noncontrolling Interest Balance (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Noncontrolling Interest [Line Items]        
Noncontrolling interest beginning balance     $ 273,826  
Net income attributable to noncontrolling interest 20,419 18,526 49,387 45,350
Foreign currency translation adjustment     (3,595)  
Distributions to noncontrolling interest     (1,850)  
Noncontrolling interest ending balance $ 317,768   $ 317,768