Derivative Financial Instruments (Schedule Of Cash Flow Hedging Instruments) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
Derivative [Line Items]
Notional Amount	$ 225,000
Total Interest Rate Cap [Member]
Derivative [Line Items]
Notional Amount	1,030,030
Fair Value Asset (Liability)	5,985
Cash Flow Hedging [Member] | Interest Rate Swap Fifty Million Notional September Two Thousand Sixteen Maturity [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	50,000
Fair Value Asset (Liability)	(2,269)
Cash Flow Hedging [Member] | Interest Rate Swap Twenty Five Million Notional October Two Thousand Sixteen Maturity [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	25,000
Fair Value Asset (Liability)	(1,175)
Cash Flow Hedging [Member] | Total Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	75,000
Fair Value Asset (Liability)	(3,444)
Cash Flow Hedging [Member] | Interest Rate Cap Twenty Million Notional September Two Thousand Fourteen Maturity [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	20,000
Fair Value Asset (Liability)	0
Cash Flow Hedging [Member] | Interest Rate Cap Forty Million Notional September Two Thousand Fourteen Maturity [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	40,000
Fair Value Asset (Liability)	0
Cash Flow Hedging [Member] | Interest Rate Cap Fifty Million Notional September Two Thousand Seventeen Maturity [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	50,000
Fair Value Asset (Liability)	951
Cash Flow Hedging [Member] | Interest Rate Cap Forty Million Notional September Two Thousand Seventeen Maturity [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	40,000
Fair Value Asset (Liability)	787
Cash Flow Hedging [Member] | Total Interest Rate Cap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	150,000
Fair Value Asset (Liability)	1,738
Cash Flow Hedging [Member] | Interest Rate Swaps and Caps [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	225,000
Fair Value Asset (Liability)	$ (1,706)