Employee Benefits - Restricted Share Units - Additional Information (Detail) - Enstar Group Limited Deferred Compensation and Ordinary Share Plan $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) employee shares	Dec. 31, 2014 USD ($) director shares	Dec. 31, 2013 USD ($) shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share units credited to the accounts of non-employee directors (shares)	2,393
Number of directors | employee	2
Restricted Stock
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of directors | director		2
Non-Employee Directors
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Restricted share units credited to the accounts of non-employee directors (shares)	5,174	3,716	3,566
Expenses related to the restricted share units | $	$ 1.0	$ 0.5	$ 0.5
Non-Employee Directors | Restricted Stock
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Conversion of stock, shares converted		11,749
Non-Employee Directors | Restricted Stock Units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Conversion of stock, shares converted		14,922