Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($) Segment	Jun. 30, 2019 USD ($) segment	Jan. 01, 2019 USD ($)
Significant Accounting Policies [Line Items]
Number of global business platforms	2	2
Operating lease right-of-use assets	$ 84,099	$ 84,099
Operating lease liability	95,806	95,806
Standby Letters of Credit
Significant Accounting Policies [Line Items]
Loss contingency, range of possible loss, portion not accrued	7,400	7,400
Bank Guaranties
Significant Accounting Policies [Line Items]
Loss contingency, range of possible loss, portion not accrued	3,600	3,600
Surety Bonds
Significant Accounting Policies [Line Items]
Loss contingency, range of possible loss, portion not accrued	$ 3,300	$ 3,300
Accounting Standards Update 2016-02
Significant Accounting Policies [Line Items]
Operating lease right-of-use assets			$ 90,500
Operating lease liability			$ 103,400