Derivative Financial Instruments (Effect of Derivative Instruments on Earnings) (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Not Designated As Hedging Instruments [Member]
Derivative Instruments Gain Loss [Line Items]
Amount Of Loss Recognized In Income On Derivatives	$ 803,000	$ 233,000
Cash Flow Hedges [Member] | Interest Rate Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Amount Of Gain Recognized In OCI	2,604,000	2,796,000
Interest Expense [Member] | Cash Flow Hedges [Member] | Interest Rate Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Amount Of Loss Reclassified From Accumulated OCI Into Income	(5,394,000)	(4,534,000)
Other Expense [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Amount Of Loss Recognized In Income On Derivatives	0	(1,000)
Other Expense [Member] | Cash Flow Hedges [Member] | Interest Rate Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Amount Of Loss Recognized In Income (Ineffective Portion)	0	0
Other Income [Member] | Not Designated As Hedging Instruments [Member] | Interest Rate Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Amount Of Loss Recognized In Income On Derivatives	$ (803,000)	$ (232,000)