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Related Party Transactions - Summary of Related Party Transactions (Detail) - USD ($)
$ 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
Related Party Transaction [Line Items]                      
Revenue $ (277,198) $ (277,193) $ (278,204) $ (280,683) $ (282,395) $ (283,770) $ (287,770) $ (291,356) $ (1,113,278) $ (1,145,291) $ (1,176,867)
Sales and marketing                 258,019 265,424 277,460
Engineering and development                 106,377 87,980 78,772
General and administrative                 117,967 124,204 163,972
Immediate Family Member of Management or Principal Owner                      
Related Party Transaction [Line Items]                      
Cost of revenue                 0 14,255 12,100
Sales and marketing                 0 755 1,200
Engineering and development                 0 1,260 1,300
General and administrative                 0 115 200
Total related party transaction expense, net                 0 16,385 14,800
Chief Executive Officer and a Director                      
Related Party Transaction [Line Items]                      
Revenue                 (5,220) (5,450) (4,250)
Revenue (contra)                 6,410 7,965 7,850
Total related party transaction impact to revenue                 1,190 2,515 3,600
Cost of revenue                 590 640 675
Total related party transaction expense, net                 $ 1,780 $ 3,155 $ 4,275