Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities	$ 144,980	$ 166,000
Operating lease right-of-use-assets	$ 144,198
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease liabilities		152,900
Operating lease right-of-use-assets		$ 152,100