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, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Net loss	$ 0	$ 0	$ 0	$ (1,990)
Interest Rate Swap [Member] | Cash Flow Hedge [Member] | Net Loss on Termination of Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swap—cash flow hedge—loss on termination	0	0	0	(1,866)
Interest Rate Swap [Member] | Cash Flow Hedge [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Interest rate swap—cash flow hedge—interest payments	0	0	0	124
Interest rate swap—cash flow hedge—ineffectiveness	$ 0	$ 0	$ 0	$ 0