Derivative Instruments and Hedging Activities - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Term Loans Rate	Mar. 31, 2013 Accrued Liabilities [Member]	Dec. 31, 2012 Accrued Liabilities [Member]
Derivative [Line Items]
Interest Rate Derivative Liabilities, at Fair Value			$ 2,148,000	$ 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	$ 1,800,000