Share Based Compensation (Summary of Future Compensation Expense in Connection With Vesting of Existing Time Based Restricted Share Awards) (Detail) (Restricted Stock [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	$ 3,695
Year One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	2,339
Year Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	1,200
Year Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total	$ 156