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Assets, Liabilities and Temporary Equity Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Assets    
Available for sale securities $ 33,482 $ 28,123
Liabilities    
Contingent earn-out obligations 29,050 15,614
Fair Value, Measurements, Recurring    
Assets    
Available for sale securities 33,482 28,123
Funds on deposit with third parties 82,679 81,276
Liabilities    
Contingent earn-out obligations 34,135 39,129
Interest rate swap agreements   1,457
Temporary equity    
Noncontrolling interests subject to put provisions 864,066 829,965
Fair Value, Measurements, Recurring | Level 1    
Assets    
Available for sale securities 33,482 28,123
Funds on deposit with third parties 82,679 81,276
Fair Value, Measurements, Recurring | Level 2    
Liabilities    
Interest rate swap agreements   1,457
Fair Value, Measurements, Recurring | Level 3    
Liabilities    
Contingent earn-out obligations 34,135 39,129
Temporary equity    
Noncontrolling interests subject to put provisions 864,066 829,965
Fair Value, Measurements, Recurring | Interest rate cap agreements    
Assets    
Interest rate derivative agreements 15,127 13,934
Fair Value, Measurements, Recurring | Interest rate cap agreements | Level 2    
Assets    
Interest rate derivative agreements 15,127 13,934
Fair Value, Measurements, Recurring | Interest rate swap agreements    
Assets    
Interest rate derivative agreements 516 3,281
Fair Value, Measurements, Recurring | Interest rate swap agreements | Level 2    
Assets    
Interest rate derivative agreements $ 516 $ 3,281