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Quarterly Information (Unaudited) - Summary of the Company's Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Total revenue $ 72,107 $ 69,194 $ 65,338 $ 65,820 $ 64,021 $ 62,475 $ 57,325 $ 56,697 $ 272,459 $ 240,518 $ 217,306
Provision for credit losses 19,464 20,152 18,589 19,134 19,427 16,410 13,386 13,791 77,339 63,014 47,348
General and administrative expenses 34,019 33,840 31,642 31,454 28,826 30,453 29,548 29,805 130,955 118,632 115,598
Interest expense 6,816 6,658 5,221 5,213 5,287 5,116 4,811 4,710 23,908 19,924 16,221
Income tax 923 3,235 3,751 2,385 4,014 4,020 3,668 3,215 10,294 14,917 14,774
Net income $ 10,885 $ 5,309 $ 6,135 $ 7,634 $ 6,467 $ 6,476 $ 5,912 $ 5,176 $ 29,963 $ 24,031 $ 23,365
Net income per common share:                      
Basic $ 0.94 $ 0.46 $ 0.53 $ 0.66 $ 0.57 $ 0.57 $ 0.50 $ 0.41 $ 2.59 $ 2.03 $ 1.82
Diluted $ 0.92 $ 0.45 $ 0.52 $ 0.65 $ 0.55 $ 0.56 $ 0.49 $ 0.40 $ 2.54 $ 1.99 $ 1.79