Fair Value Measurements - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended
	Oct. 31, 2012	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized gains on interest rate swap liability		$ 0	$ 7,000
Payment of Interest rate swap liability	$ 7,000