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Segment and Geographical Information - Long Lived Assets and Continuing Operations by Country (Details) - 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
Revenues From External Customers And Long Lived Assets [Line Items]                      
Revenues $ 487,325 $ 484,781 $ 467,815 $ 459,923 $ 442,942 $ 427,300 $ 413,696 $ 405,164 $ 1,899,843 $ 1,689,102 $ 1,519,084
Income (loss) before income taxes 107,922 $ 111,435 $ 113,765 $ 82,963 108,089 $ 100,200 $ 96,389 $ 74,842 416,084 379,520 337,595
Long-lived assets 35,996       28,099       35,996 28,099 27,465
United States [Member]                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Revenues                 1,607,140 1,419,658 1,281,580
Income (loss) before income taxes                 337,914 299,764 269,791
Long-lived assets 30,999       27,443       30,999 27,443 26,685
Canada [Member]                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Revenues                 292,703 269,444 237,504
Income (loss) before income taxes                 78,170 79,756 67,804
Long-lived assets $ 4,997       $ 656       $ 4,997 $ 656 $ 780