Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended					3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Term Loans Rate	Jun. 30, 2013 Accrued Liabilities [Member]	Dec. 31, 2012 Accrued Liabilities [Member]	Jun. 30, 2013 Cash Flow Hedging [Member] Interest Expense [Member] Interest Rate Swap [Member]	Jun. 30, 2012 Cash Flow Hedging [Member] Interest Expense [Member] Interest Rate Swap [Member]	Jun. 30, 2013 Cash Flow Hedging [Member] Interest Expense [Member] Interest Rate Swap [Member]	Jun. 30, 2012 Cash Flow Hedging [Member] Interest Expense [Member] Interest Rate Swap [Member]
Derivative [Line Items]
Interest Rate Derivative Liabilities, at Fair Value						$ 1,719,000	$ 2,591,000
LIBOR Swap Agreement, period					3 years
Swap, fixed interest rate					1.11%
Spread over LIBOR					1.95%
Actual interest rate					3.06%
Amount to be reclassified from accumulated other comprehensive loss to interest expense			1,900,000
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion	27,000	471,000	34,000	1,271,000
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net								$ 457,000	$ 437,000	$ 906,000	$ 859,000