Derivative Financial Instruments Cash Flow Hedges of Interest Rate Risk (Narrative) (Detail) (Cash Flow Hedging [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative [Line Items]
Unamortized loss on termination of cash flow hedges			$ 30,900,000
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	7,500,000		7,500,000
Derivative Instruments, Loss Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing	0	0	107,000	0
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Unamortized loss on termination of cash flow hedges			8,000,000
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$ 4,600,000		$ 4,600,000