Summary of Significant Accounting Policies - Summary of Lease Assets and Liabilities (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Assets And Liabilities Lessee [Abstract]
Operating lease assets	$ 234,390
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseRightOfUseAsset
Finance lease assets	$ 68
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentNet
Total leased assets	$ 234,458
Operating lease liabilities	$ 23,613
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityCurrent
Finance lease liabilities	$ 28
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	hubs:AccruedExpensesAndOtherCurrentLiabilities
Operating lease liabilities, net of current portion	$ 244,216
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OperatingLeaseLiabilityNoncurrent
Total lease liabilities	$ 267,857