Subsequent Events - Additional Information (Detail) (USD $)			1 Months Ended
	Apr. 27, 2013	Apr. 22, 2013 Asset Sale Agreement	May 31, 2013 Restated Purchase and Sale Agreement
Subsequent Event [Line Items]
Undeveloped land located in Tyngsborough, MA, Sales price	$ 18,750,000		$ 3,500,000
Undeveloped land located in Tyngsborough, MA, non-refundable deposit			125,000
Undeveloped Land, expected date to complete sale			Aug. 30, 2013
Undeveloped Land, expected period of extension to complete sale			45 days
Total dispute amount under asset sale agreement		$ 1,400,000