Contract Assets and Contract Liabilities - Summary of Accounts Receivable and Unbilled, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 13, 2016	Dec. 31, 2015
Contract With Customer Asset And Liability [Line Items]
Accounts receivable	$ 85,120		$ 55,599
Unbilled receivables	49,361		28,153
Less: allowance for doubtful accounts	(1,032)		(673)	$ (3,222)	$ (3,222)	$ (1,724)
Total accounts receivable and unbilled, net	133,449		$ 83,079
ASC 606
Contract With Customer Asset And Liability [Line Items]
Accounts receivable		$ 70,943
Unbilled receivables		36,696
Less: allowance for doubtful accounts		(673)
Total accounts receivable and unbilled, net		106,966
ASC 606 | Impact of Adoption of ASC 606 - Adjustments
Contract With Customer Asset And Liability [Line Items]
Accounts receivable		15,344
Unbilled receivables		8,543
Total accounts receivable and unbilled, net	$ (28,729)	$ 23,887