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Variable Interest Entities (VIEs) - Schedule of Maximum Exposure to Loss (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Variable Interest Entity [Line Items]    
Investments in unconsolidated subsidiaries $ 238,001 $ 232,238
Other current assets 227,421 179,656
Co-investment commitments 38,600  
Non-Consolidated Variable Interest Entities [Member]    
Variable Interest Entity [Line Items]    
Investments in unconsolidated subsidiaries 26,273 31,041
Other current assets 3,401 3,314
Co-investment commitments 2,364 168
Maximum exposure to loss $ 32,038 $ 34,523