Derivative Instruments and Hedging Activities - Income for Derivatives Designated as Hedging Instruments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Net loss		$ (112)	$ (1,990)	$ (331)
Interest Expense [Member] | Interest Rate Swap [Member] | Cash Flow Hedge [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swap - cash flow hedge - loss on termination			(1,866)
Interest rate swap - cash flow hedge - interest payments		112	124	331
Interest rate swap - cash flow hedge -ineffectiveness