Leases - Summary of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets And Liabilities Lessee [Abstract]
Operating lease right-of-use assets	$ 53,627	$ 0
Other current liabilities	$ 9,340
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Operating lease liabilities	$ 46,238	$ 0
Total operating lease liabilities	$ 55,578
Weighted Average Remaining Lease Term (years)
Operating leases	6 years 6 months
Weighted Average Discount Rate
Operating leases	5.90%