Wind-Down and Exit Costs - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Wind Down Expenses [Abstract]
Amount of wind-down reserve			$ 854,000
Payments net of subtenant income recorded against reserve		916,000
Additional expense recorded to revise estimated reserve at period-end		$ 62,000
Lease termination date	Jun. 30, 2013