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Assets, Liabilities and Temporary Equity Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Assets    
Available-for-sale securities $ 48,667 $ 33,482
Fair Value, Measurements, Recurring    
Assets    
Available-for-sale securities 48,667  
Funds on deposit with third parties 76,527  
Liabilities    
Contingent earn-out obligations 32,903  
Interest rate swap agreements 25  
Temporary equity    
Noncontrolling interests subject to put provisions 912,705  
Fair Value, Measurements, Recurring | Level 1    
Assets    
Available-for-sale securities 48,667  
Funds on deposit with third parties 76,527  
Fair Value, Measurements, Recurring | Level 2    
Liabilities    
Interest rate swap agreements 25  
Fair Value, Measurements, Recurring | Level 3    
Liabilities    
Contingent earn-out obligations 32,903  
Temporary equity    
Noncontrolling interests subject to put provisions 912,705  
Interest rate cap agreements | Fair Value, Measurements, Recurring    
Assets    
Interest rate derivative agreements 6,868  
Interest rate cap agreements | Fair Value, Measurements, Recurring | Level 2    
Assets    
Interest rate derivative agreements $ 6,868