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Summarized Quarterly Financial Data (Unaudited) - Summary of Unaudited Quarterly Financial Results of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Total revenues $ 348,133 $ 352,997 $ 333,597 $ 313,638 $ 345,974 $ 322,141 $ 310,364 $ 260,482 $ 1,348,365 $ 1,238,961 $ 1,030,019
Income from operations 41,310 55,503 47,673 35,675 50,899 45,318 43,103 27,326 180,161 166,646 137,915
Income before provision for income taxes 26,854 38,760 30,895 19,352 34,755 28,971 27,869 13,068 115,861 104,663 59,344
Net income $ 21,923 $ 28,431 $ 22,614 $ 14,243 $ 25,060 $ 21,314 $ 20,771 $ 9,478 $ 87,211 $ 76,623 $ 109,658
Basic net income per common share $ 0.61 $ 0.79 $ 0.63 $ 0.40 $ 0.70 $ 0.60 $ 0.58 $ 0.27 $ 2.43 $ 2.15 $ 3.09
Diluted net income per common share $ 0.61 $ 0.79 $ 0.63 $ 0.40 $ 0.70 $ 0.59 $ 0.58 $ 0.26 $ 2.42 $ 2.13 $ 3.07