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Clawback Obligations by Segment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Product Liability Contingency [Line Items]    
Clawback obligations $ 2,815 $ 2,171
Credit Segment    
Product Liability Contingency [Line Items]    
Clawback obligations 2,815 2,171
Credit Segment | Blackstone Holdings    
Product Liability Contingency [Line Items]    
Clawback obligations 1,340 1,059
Credit Segment | Current And Former Blackstone Personnel    
Product Liability Contingency [Line Items]    
Clawback obligations $ 1,475 $ 1,112