Share Based Compensation (Schedule of Future Compensation Expense in Connection With Vesting of Existing Non-Employee Trustee Restricted Share Awards) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	$ 532
2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	477
2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	$ 55