Employee Benefits - Restricted Share Units - Additional Information (Detail) (Enstar Group Limited Deferred Compensation and Ordinary Share Plan [Member], Non-Employee Directors [Member], USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Enstar Group Limited Deferred Compensation and Ordinary Share Plan [Member] | Non-Employee Directors [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share units credited to the accounts of non-employee directors	1,029	632
Expenses related to the restricted share units	$ 0.1	$ 0.1