Derivative Instruments and Hedging Activities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) Swap	Dec. 31, 2017 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Reclassified as a reduction to interest expense, expected during the next 12 months	$ 2,500,000
Unrealized gain or loss on derivatives, tax (expense) benefit	$ 3,100,000	$ 5,700,000
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swaps held | Swap	5
Notional amount of interest rate swap	$ 1,000,000,000
Not Designated as Hedge Accounting Relationships [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives outstanding	$ 0	$ 0