Leases - Additional Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Lease payments for leases signed but not yet commenced	$ 50,927
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Renewal term	3 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	10 years
Renewal term	10 years