Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended					3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Term Loans Rate	Sep. 30, 2013 Accrued Liabilities [Member]	Dec. 31, 2012 Accrued Liabilities [Member]	Sep. 30, 2013 Cash Flow Hedging [Member] Interest Expense [Member] Interest Rate Swap [Member]	Sep. 30, 2012 Cash Flow Hedging [Member] Interest Expense [Member] Interest Rate Swap [Member]	Sep. 30, 2013 Cash Flow Hedging [Member] Interest Expense [Member] Interest Rate Swap [Member]	Sep. 30, 2012 Cash Flow Hedging [Member] Interest Expense [Member] Interest Rate Swap [Member]
Derivative [Line Items]
Interest Rate Derivative Liabilities, at Fair Value						$ 1,358,000	$ 2,591,000
Swap, fixed interest rate					1.11%
Derivative, Maturity Years					3 years
Derivative, Maturity Date			Jul. 01, 2014
Spread over LIBOR					1.95%
Actual interest rate					3.06%
Amount to be reclassified from accumulated other comprehensive loss to interest expense			(1,500,000)
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion	106,000	494,000	141,000	1,765,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net								$ 467,000	$ 440,000	$ 1,374,000	$ 1,299,000