Derivatives and Hedging Activities - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative, Credit Risk Related Contingent Features, Existence and Nature	Certain of our derivative contracts contain a provision where if we default on any of our indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then we could also be declared in default on our derivative obligations. As of September 30, 2013, we had not breached the provisions of these agreements.  If we had breached these provisions, we could have been required to settle our obligations under the agreements at their termination value of $6.7 million.
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 2,691,000	$ (21,869,000)	$ 108,000	$ (26,054,000)
Unrealized losses from the effective portion of derivative instruments	997,000	179,000
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	3,725,000	4,545,000
Derivative contracts, collateral	Certain of our derivative contracts are credit enhanced by either FNMA or Freddie Mac.  These derivative contracts require that our credit enhancing party maintain credit ratings above a certain level.  If our credit support providers were downgraded below Baa1 by Moody’s or BBB+ by Standard & Poor’s, or S&P, we may be required to either post 100 percent collateral or settle the obligations at their termination value of $9.7 million as of September 30, 2013.  Both FNMA and Freddie Mac are currently rated Aaa by Moody’s and AA+ by S&P, and therefore, the provisions of this agreement have not been breached and no collateral has been posted related to these agreements as of September 30, 2013.
Credit Risk Related Contingent Features Termination Value	4,700,000
Reclassification adjustment for losses included in net income for the effective portion of derivative instruments	3,725,000	4,545,000
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	(145,000)	(181,000)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	2,583,000	4,185,000
Credit Default Option [Member]
Derivative [Line Items]
Credit Risk Related Contingent Features Termination Value	14,900,000
Other Credit Enhancements
Derivative [Line Items]
Credit Risk Related Contingent Features Termination Value	3,400,000
Termination
Derivative [Line Items]
Fair Value of Credit Risk Derivatives	17,900,000
Interest Expense
Derivative [Line Items]
Change in Fair Value of Derivatives, Ineffective portion	(4,000)	4,000
Interest Expense | Cash Flow Hedging [Member] | Interest Rate Caps
Derivative [Line Items]
Change in fair value of interest rate derivatives included in AOCI and expected to be reclassified in the next 12 months	9,700,000
Interest Expense | Interest rate contracts
Derivative [Line Items]
Reclassification adjustment for losses included in net income for the effective portion of derivative instruments	3,725,000	4,545,000
net liability position [Member]
Derivative [Line Items]
Credit Risk Related Contingent Features Termination Value	19,600,000
Designated as Hedging Instrument [Member] | Interest Rate Caps
Derivative [Line Items]
Derivative, Number of Instruments Held	7
Derivative, Notional Amount	180,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Number of Instruments Held	14
Derivative, Notional Amount	717,000,000
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(69,000)	(13,000)
Not Designated as Hedging Instrument [Member] | Interest Rate Caps
Derivative [Line Items]
Derivative, Number of Instruments Held	15
Derivative, Notional Amount	134,326,000
Not Designated as Hedging Instrument [Member] | Interest Expense
Derivative [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	(69,000)	(13,000)
Parent Company [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	2,691,000		108,000
Unrealized losses from the effective portion of derivative instruments	997,000	179,000
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax	$ 3,725,000	$ 4,545,000