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Summary of Significant Accounting Policies - Schedule of Revenue Calculated under Old and New Accounting Methods (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Revenue | $ 1,337,973 |
Contract assets | 126,688 | $ 123,197
Contract liabilities | 33,494 | 38,571
ASU 2014-09 | As Reported |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Revenue | 1,337,973 |
Contract assets | 126,688 | 123,197
Contract liabilities | $ 33,494 | $ 38,571

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