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Variable Interest Entities (VIEs) - Schedule of Maximum Exposure to Loss (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Variable Interest Entity [Line Items]    
Investments in unconsolidated subsidiaries $ 232,238 $ 217,943
Other current assets 179,656 220,956
Co-investment commitments 31,600  
Non-Consolidated Variable Interest Entities [Member]    
Variable Interest Entity [Line Items]    
Investments in unconsolidated subsidiaries 31,041 21,457
Other current assets 3,314 3,723
Co-investment commitments 168 180
Maximum exposure to loss $ 34,523 $ 25,360