Earnings Per Share - Comparison of Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Basic earnings per ordinary share:
Net earnings attributable to Enstar Group Limited	$ 40,594	$ 14,545	$ 86,114	$ 59,392
Weighted-average ordinary shares outstanding — basic (in shares)	19,295,280	19,252,359	19,289,119	19,244,951
Net earnings per ordinary share attributable to Enstar Group Limited - basic (in dollars per share)	$ 2.10	$ 0.76	$ 4.46	$ 3.09
Diluted earnings per ordinary share:
Net earnings attributable to Enstar Group Limited	$ 40,594	$ 14,545	$ 86,114	$ 59,392
Weighted-average ordinary shares outstanding — basic (in shares)	19,295,280	19,252,359	19,289,119	19,244,951
Effect of dilutive securities:
Warrants (in shares)	92,330	78,250	89,960	69,776
Weighted-average ordinary shares outstanding — diluted (in shares)	19,430,464	19,383,753	19,420,541	19,364,775
Net earnings per ordinary share attributable to Enstar Group Limited - diluted (in dollars per share)	$ 2.09	$ 0.75	$ 4.43	$ 3.07
Unvested shares
Effect of dilutive securities:
Shares (in shares)	25,762	39,524	25,448	38,017
Restricted share units
Effect of dilutive securities:
Shares (in shares)	17,092	13,620	16,014	12,031