Schedule of Accumulated Other Comprehensive Income, Net of Tax (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Deferred taxes	$ (3,896)	$ (10,263)
Accumulated other comprehensive income, net of tax	4,078	23,384	$ 54,028
Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Net unrealized gains (losses)	(2,184)	10,527
Common Shares
Schedule of Available-for-sale Securities [Line Items]
Net unrealized gains (losses)	$ 10,158	22,751
Other
Schedule of Available-for-sale Securities [Line Items]
Net unrealized gains (losses)		$ 369