Share-Based Compensation Plans - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended			6 Months Ended
	Jun. 08, 2012	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Mar. 14, 2013	Mar. 12, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares granted for option award	30,000
Exercised price of shares granted for option award	$ 7.80
Restricted shares issued to the Board of Trust Managers	5,000
Compensation expenses option award				$ 12,000		$ 12,000
Compensation expenses shares vested				39,000		39,000
Current market price of shares issued to the Board of Trust Managers	$ 7.80
Restricted shares issued to executive officer							6,666	10,000
Current Market price of restricted shares issued to executive officer							$ 7.22	$ 7.27
Terms of Award			Restricted shares vest based on two years of continuous service with one-third of the shares vesting immediately upon issuance of the shares and one-third vesting at the end of each of the next two years.
Compensation expense		33,000		16,000	8,000	56,000
Total Unrecognized Compensation expenses restricted shares		$ 29,000			$ 29,000
Vesting period					2 years
Cost recognized to the restricted shares (in years)					2 years