Summary of Significant Accounting Policies - Schedule of Contract Assets and Contract Liabilities Reported under New Accounting Standard (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Contract receivables, net	$ 230,966	$ 168,318
Contract assets	126,688	123,197
Contract liabilities	33,494	38,571
Retained earnings	486,442	434,766
ASU 2014-09 | As Reported
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Contract receivables, net		291,515
Contract assets	126,688	123,197
Deferred revenue		38,571
Contract liabilities	$ 33,494	38,571
Retained earnings		$ 434,766