Revenues from Contracts with Customers - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenue From Contract With Customer [Abstract]
Receivables related to revenue from contract with customer	$ 733,900,000		$ 733,900,000		$ 778,400,000
Impairments related to revenue receivables	0	$ 0	0	$ 0
Deferred revenue	16,400,000		16,400,000		12,900,000
Deferred revenue recognized	6,800,000	$ 7,000,000.0	7,400,000	$ 8,100,000
Capitalized costs	$ 1,400,000		$ 1,400,000		$ 1,400,000