Revenue from Contracts with Customers - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue From Contract With Customers [Line Items]
Payment terms on invoiced amounts	30 days
Deferred contract costs	$ 20,019,000	$ 70,021,000
Contract costs amortization	96,000,000.0	67,700,000
Contract costs impairment loss	0
Prepaid Expenses and Other Current Assets [Member]
Revenue From Contract With Customers [Line Items]
Deferred contract costs	20,000,000.0	70,000,000.0
Other Assets [Member]
Revenue From Contract With Customers [Line Items]
Deferred contract costs	$ 4,000,000.0	$ 13,100,000
Minimum [Member]
Revenue From Contract With Customers [Line Items]
Initial term of contract	2 months
Maximum [Member]
Revenue From Contract With Customers [Line Items]
Initial term of contract	60 months