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NON-CONSOLIDATED VARIABLE INTEREST ENTITIES AND SERVICING ASSETS - Income Statement Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Variable Interest Entity [Line Items]      
Revenues $ 650,810 $ 673,246 $ 686,894
Net income $ 66,956 $ 93,229 $ 21,297