Contract Assets and Contract Liabilities - Summary of Accounts Receivable and Unbilled, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Contract With Customer Asset And Liability [Line Items]
Accounts receivable	$ 67,616		$ 55,599
Unbilled receivables	43,688		28,153
Less: allowance for doubtful accounts	(650)		(673)
Total accounts receivable and unbilled, net	110,654		$ 83,079
ASC 606
Contract With Customer Asset And Liability [Line Items]
Accounts receivable		$ 55,599
Unbilled receivables		37,906
Less: allowance for doubtful accounts		(673)
Total accounts receivable and unbilled, net		92,832
ASC 606 | Impact of Adoption of ASC 606 - Adjustments
Contract With Customer Asset And Liability [Line Items]
Unbilled receivables		9,753
Total accounts receivable and unbilled, net	$ (12,733)	$ 9,753