Derivative Financial Instruments Derivative Financial Instruments (Schedule Of Cash Flow Hedging Instruments) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Total Interest Rate Cap [Member]
Derivative [Line Items]
Notional amount	$ 1,030,030
Fair Value Asset (Liability)	2,943
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)	(1,795)
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)	(932)
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)	(2,727)
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 Forty Three Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	43,500
Fair Value Asset (Liability)	103
Cash Flow Hedging [Member] | Interest Rate Cap Two Hundred Sixteen Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	216,500
Fair Value Asset (Liability)	389
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)	637
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)	534
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)	1,663
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)	$ (1,064)