Derivative Instruments and Hedging Activities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 USD ($) Swap	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($) Swap
Derivative Instruments, Gain (Loss) [Line Items]
Loss related to ineffective portion of derivatives recognized in other (income) expense, net	$ (1,000)	$ (286,000)
Reclassified as an increase to interest expense, expected during the next 12 months	9,824,000
Unrealized loss on derivatives, tax benefit	(8,537,000)
Termination value of derivatives in a net liability position	40,456,000
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
Notional amount of interest rate swap				$ 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