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Revenue and Related Contract Costs and Contract Liabilities - Summary of Changes in Contract Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue From Contract With Customer [Abstract]    
Balance at January 1 $ 35,600 $ 31,981
Cash additions 210,871 179,238
Revenue recognized (196,158) (174,620)
Foreign exchange translation adjustment 483 (999)
Balance at December 31 $ 50,796 $ 35,600