Leases - Additional Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)	Jul. 31, 2019 USD ($) ft²	May 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	Nov. 30, 2017 ft²
Lessee, Lease, Description [Line Items]
Lease term	9 years 2 months 12 days
Renewal term	5 years
Termination period	3 years
Operating lease liability	$ 77,779
Operating lease right-of-use assets	59,417			$ 0
Total lease payments	$ 104,811
Headquarters [Member]
Lessee, Lease, Description [Line Items]
Area of real estate property | ft²					147,061
Term of lease					126 months
Operating lease liability			$ 58,600
Operating lease right-of-use assets			$ 58,600
Headquarter Expansion [Member] | Subsequent Event [Member]
Lessee, Lease, Description [Line Items]
Area of real estate property | ft²		67,214
Term of lease		102 months
Total lease payments		$ 35,000
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lease term	10 years 6 months