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Schedule of Rollforward of Non-controlling Interest Balance (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Noncontrolling Interest [Line Items]    
Non-controlling interest beginning balance $ 253,024  
Net income attributable to non-controlling interest 8,158 $ 7,587
Foreign currency translation adjustment (2,454)  
Distributions to non-controlling interest (2,178)  
Non-controlling interest ending balance 256,912  
Non-controlling Interest    
Noncontrolling Interest [Line Items]    
Gain recorded in accumulated other comprehensive loss 60  
Loss reclassified from accumulated other comprehensive loss into earnings $ 302