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Assets, Liabilities and Temporary Equity Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Assets    
Available-for-sale securities $ 53,259 $ 33,482
Fair Value, Measurements, Recurring    
Assets    
Available-for-sale securities 53,259  
Funds on deposit with third parties 76,773  
Liabilities    
Contingent earn-out obligations 14,198  
Temporary equity    
Noncontrolling interests subject to put provisions 971,744  
Fair Value, Measurements, Recurring | Level 1    
Assets    
Available-for-sale securities 53,259  
Funds on deposit with third parties 76,773  
Fair Value, Measurements, Recurring | Level 3    
Liabilities    
Contingent earn-out obligations 14,198  
Temporary equity    
Noncontrolling interests subject to put provisions 971,744  
Interest rate cap agreements | Fair Value, Measurements, Recurring    
Assets    
Interest rate derivative agreements 2,453  
Interest rate cap agreements | Fair Value, Measurements, Recurring | Level 2    
Assets    
Interest rate derivative agreements $ 2,453