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Loans and Finance Receivables, Credit Quality Information and Allowances and Liabilities for Estimated Losses on Loans and Finance Receivables - Schedule of Revenue Generated from Loans and Finance Receivables (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts Notes And Loans Receivable [Line Items]                      
Total loans and finance receivables revenue                 $ 1,112,701 $ 842,851 $ 744,092
Other                 1,373 890 1,477
Total Revenue $ 312,596 $ 293,879 $ 253,301 $ 254,298 $ 243,696 $ 217,878 $ 189,904 $ 192,263 1,114,074 843,741 745,569
Short-term Loans                      
Accounts Notes And Loans Receivable [Line Items]                      
Total loans and finance receivables revenue                 219,210 197,408 196,255
Line of Credit Accounts                      
Accounts Notes And Loans Receivable [Line Items]                      
Total loans and finance receivables revenue                 363,495 262,760 220,462
Installment Loans and RPAs                      
Accounts Notes And Loans Receivable [Line Items]                      
Total loans and finance receivables revenue                 $ 529,996 $ 382,683 $ 327,375