Related Party Transactions - Additional Information (Detail) (USD $)	1 Months Ended	6 Months Ended
	Sep. 04, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Related Party Transaction [Line Items]
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, maximum percentage		6.00%
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, amount		$ 189,000	$ 170,000
Deferred compensation, employee contribution, percentage		2.00%
Deferred compensation, company contribution, amount		103,000	109,000
Deferred compensation, cumulative unfunded liability		1,500,000		2,200,000
Ancillary costs and expenses		3,200,000	3,100,000
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses		406,000		499,000
New sublease expiration date		2017-03
Percentage of annual increase in base rent		3.00%
Rent expense		428,000	452,000
Insurance Commissions and fees expense		167,000	130,000
Monthly consulting fees	60,000
Term of consulting agreement	2 years
Consulting fees		$ 360,000