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Schedule of Amortized Cost and Estimated Fair Value of Investments (Detail) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 1,673,190	$ 1,405,419
Gross Unrealized Gains		35,392	40,666
Gross Unrealized Losses		(5,546)	(6,899)
Estimated Fair Value		1,703,036	1,439,186
Other than temporary impairments recognized in AOCI	[1]	(11)	(17)
Common Shares
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		103,019	99,297
Gross Unrealized Gains		20,496	25,689
Gross Unrealized Losses		(2,277)	(2,938)
Estimated Fair Value		121,238	122,048
Other Invested Assets
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		28,887	33,174
Gross Unrealized Gains		2,289	489
Estimated Fair Value		31,176	33,663
Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,541,284	1,272,948
Gross Unrealized Gains		12,607	14,488
Gross Unrealized Losses		(3,269)	(3,961)
Estimated Fair Value		1,550,622	1,283,475
Other than temporary impairments recognized in AOCI	[1]	(11)	(17)
Fixed Maturities | U.S. Treasury and Agency Obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		88,489	78,569
Gross Unrealized Gains		1,811	2,281
Gross Unrealized Losses		(44)	(83)
Estimated Fair Value		90,256	80,767
Fixed Maturities | Obligations of States and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		230,355	188,452
Gross Unrealized Gains		3,027	3,718
Gross Unrealized Losses		(850)	(697)
Estimated Fair Value		232,532	191,473
Fixed Maturities | Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		201,267	205,814
Gross Unrealized Gains		3,193	3,709
Gross Unrealized Losses		(480)	(764)
Estimated Fair Value		203,980	208,759
Other than temporary impairments recognized in AOCI	[1]		(4)
Fixed Maturities | Asset-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		257,401	177,853
Gross Unrealized Gains		963	713
Gross Unrealized Losses		(193)	(303)
Estimated Fair Value		258,171	178,263
Other than temporary impairments recognized in AOCI	[1]	(11)	(13)
Fixed Maturities | Commercial Mortgage-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		171,467	133,984
Gross Unrealized Gains		115	21
Gross Unrealized Losses		(614)	(847)
Estimated Fair Value		170,968	133,158
Fixed Maturities | Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		453,473	380,704
Gross Unrealized Gains		2,838	3,421
Gross Unrealized Losses		(463)	(709)
Estimated Fair Value		455,848	383,416
Fixed Maturities | Foreign Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		138,832	107,572
Gross Unrealized Gains		660	625
Gross Unrealized Losses		(625)	(558)
Estimated Fair Value		$ 138,867	$ 107,639
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