Derivative Financial Instruments (Schedule Of Interest Rate Swaps) (Details) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Total Interest Rate Caps [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Notional Amount	$ 60,000
Fair Value Gain (Loss)	6
Cash Flow Hedges [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Notional Amount	225,000
Fair Value Gain (Loss)	(9,485)
Cash Flow Hedges [Member] | Total Interest Rate Swaps [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Notional Amount	165,000
Fair Value Gain (Loss)	(9,491)
Interest Rate Swap 1 [Member] | Cash Flow Hedges [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Notional Amount	50,000
Fair Value Gain (Loss)	(2,398)
Interest Rate Swap 2 [Member] | Cash Flow Hedges [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Notional Amount	40,000
Fair Value Gain (Loss)	(2,001)
Interest Rate Swap 3 [Member] | Cash Flow Hedges [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Notional Amount	50,000
Fair Value Gain (Loss)	(3,352)
Interest Rate Swap 4 [Member] | Cash Flow Hedges [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Notional Amount	25,000
Fair Value Gain (Loss)	(1,740)
Interest Rate Caps 1 [Member] | Cash Flow Hedges [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Notional Amount	20,000
Fair Value Gain (Loss)	2
Interest Rate Caps 2 [Member] | Cash Flow Hedges [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Notional Amount	40,000
Fair Value Gain (Loss)	$ 4