Restricted Share Grants - Additional Information (Detail) (USD $)	12 Months Ended		1 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Restricted Stock [Member]	May 28, 2013 2007 Stock Option Plan [Member]	Feb. 28, 2013 2007 Stock Option Plan [Member]	Dec. 31, 2013 2007 Stock Option Plan [Member]	May 20, 2013 2007 Stock Option Plan [Member]	Jan. 31, 2013 2007 Stock Option Plan [Member]	Jan. 31, 2013 2007 Stock Option Plan [Member] Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for issuance					1,000,000	100,000		600,000
Increase in shares issuable under the Trust's 2007 Stock Option Plan by shareholders							500,000
Initial public offering			500,000	100,000
Non-cash compensation expense	$ 897,000	$ 899,000
Restricted Shares forfeited	7,500
Unrecognized compensation cost	$ 5,648,000
Unrecognized compensation cost, forfeiture	592,500