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Segment and Geographical Information - Long Lived Assets and Operations by Country (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Revenues From External Customers And Long Lived Assets [Line Items]          
Revenues $ 383,626 $ 355,709 $ 1,125,221 $ 1,050,752  
Income (loss) before income taxes 88,437 74,953 250,531 218,588  
Long-lived assets 28,862   28,862   $ 29,408
United States [Member]          
Revenues From External Customers And Long Lived Assets [Line Items]          
Revenues 323,560 298,671 947,618 876,363  
Income (loss) before income taxes 71,525 61,116 200,137 170,172  
Long-lived assets 27,997   27,997   28,621
Canada [Member]          
Revenues From External Customers And Long Lived Assets [Line Items]          
Revenues 60,066 57,038 177,603 174,389  
Income (loss) before income taxes 16,912 $ 13,837 50,394 $ 48,416  
Long-lived assets $ 865   $ 865   $ 787