Derivative Financial Instruments Derivative Financial Instruments (Schedule Of Cash Flow Hedging Instruments) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Total Interest Rate Cap [Member]
Derivative [Line Items]
Notional Amount	$ 1,030,030
Fair Value Asset (Liability)	4,720
Cash Flow Hedging [Member] | Interest Rate Swaps and Caps [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	485,000
Fair Value Asset (Liability)	(314)
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)	(1,906)
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)	(986)
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)	(2,892)
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)	866
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)	721
Cash Flow Hedging [Member] | Total Interest Rate Cap [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount	410,000
Fair Value Asset (Liability)	$ 2,578