Derivative Instruments and Hedging Activities - Additional Information (Detail)	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($) Swap	Jun. 30, 2016 USD ($) Swap	Jun. 30, 2015 USD ($) Swap	Dec. 31, 2015 USD ($)
Derivative Instruments, Gain (Loss) [Line Items]
Loss related to ineffective portion of derivatives recognized in other (income) expense, net	$ (1,000)	$ (1,000)	$ (287,000)
Reclassified as an increase to interest expense, expected during the next 12 months		13,474,000
Unrealized loss on derivatives, tax benefit		(11,500,000)
Termination value of derivatives in a net liability position		47,809,000
Collateral posted relating to credit risk-related contingent features		$ 0
Forward Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swaps held | Swap	5		5
Notional amount of interest rate swap	$ 1,000,000,000		$ 1,000,000,000
Combined Interest Rate Cash Flow Hedges, All Swaps [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Number of interest rate swaps held | Swap		4
Notional amount of interest rate swap		$ 1,250,000,000
Combined Interest Rate Cash Flow Hedges, All Swaps [Member] | Forward 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