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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Income Statement Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Variable Interest Entity [Line Items]        
Net income $ 27,998 $ 21,953 $ 53,539 $ 45,297