Leases - Additional information (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Leased Assets [Line Items]
Operating lease right-of-use assets (Note 16)	$ 176,219	$ 194,000	$ 0
Operating lease, liability	113,601	119,000
Other	(40,365)		(129,312)
Other current liabilities	(140,879)		$ (184,229)
Lease not yet commenced	$ 705,000
Accounting Standards Update 2016-02
Operating Leased Assets [Line Items]
Other		85,000
Other current liabilities		$ 10,000