Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Equipment leases classified as finance leases	$ 0.6
Office Facilities, Buildings, Telecommunications, And Other Equipment
Lessee, Lease, Description [Line Items]
Lease renewal term	5 years
Termination period	1 year
Office Facilities, Buildings, Telecommunications, And Other Equipment | Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Office Facilities, Buildings, Telecommunications, And Other Equipment | Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	10 years