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Receivables, Net - Summary of Receivables, Net (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Insurance premium receivables $ 94,136   $ 98,220
Servicing fee receivables 50,351   51,183
Income tax receivables 33,638   17,106
Receivables related to Non-Residual Trusts 20,800   25,201
Other Receivables 64,904   27,837
Total receivables 263,829   219,547
Less: Allowance for uncollectible receivables (3,909)   (3,918)
Receivables, net 259,920   $ 215,629
WCO [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Other Receivables 200    
Investment Advisory, Management and Administrative Fees $ 200 $ 400