Derivative Financial Instruments Derivative Financial Instruments (Schedule Of Cash Flow Hedging Instruments) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Total Interest Rate Cap
Derivative [Line Items]
Notional amount	$ 970,030
Fair Value Asset (Liability)	1,089
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap Fifty Million Notional September Two Thousand Sixteen Maturity [Member]
Derivative [Line Items]
Notional amount	50,000
Fair Value Asset (Liability)	(1,222)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap Twenty Five Million Notional October Two Thousand Sixteen Maturity [Member]
Derivative [Line Items]
Notional amount	25,000
Fair Value Asset (Liability)	(645)
Cash Flow Hedging | Designated as Hedging Instrument | Total Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	75,000
Fair Value Asset (Liability)	(1,867)
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Cap Forty Three Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity
Derivative [Line Items]
Notional amount	43,500
Fair Value Asset (Liability)	26
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Cap Two Hundred Sixteen Million Five Hundred Thousand Notional August Two Thousand Sixteen Maturity
Derivative [Line Items]
Notional amount	216,500
Fair Value Asset (Liability)	89
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Cap Fifty Million Notional September Two Thousand Seventeen Maturity
Derivative [Line Items]
Notional amount	50,000
Fair Value Asset (Liability)	299
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Cap Forty Million Notional September Two Thousand Seventeen Maturity
Derivative [Line Items]
Notional amount	40,000
Fair Value Asset (Liability)	254
Cash Flow Hedging | Designated as Hedging Instrument | Total Interest Rate Cap
Derivative [Line Items]
Notional amount	350,000
Fair Value Asset (Liability)	668
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swaps and Caps
Derivative [Line Items]
Notional amount	425,000
Fair Value Asset (Liability)	$ (1,199)