New Accounting Pronouncements - Schedule of Impact of Adoption (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net		$ 794,446	$ 732,405
Accounts payable and accrued expenses		168,031	$ 126,937
Accounting Standards Update 2016-02 | Scenario, Forecast | Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accrued Rent	$ 30,000
Accounting Standards Update 2016-02 | Scenario, Forecast | Minimum | Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liabilities	270,000
Right-of-use asset	270,000
Accounting Standards Update 2016-02 | Scenario, Forecast | Maximum | Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liabilities	290,000
Right-of-use asset	$ 290,000
Balances Without Adoption of Revenue Guidance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net		783,776
Accounts payable and accrued expenses		157,361
Effect of Change Higher (Lower) | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net		10,670
Accounts payable and accrued expenses		$ 10,670