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Schedule of Amortized Cost and Estimated Fair Value of Investments (Detail) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 1,669,586	$ 1,405,419
Gross Unrealized Gains		28,054	40,666
Gross Unrealized Losses		(8,534)	(6,899)
Estimated Fair Value		1,689,106	1,439,186
Other than temporary impairments recognized in AOCI	[1]	(10)	(17)
Common Shares
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		99,257	99,297
Gross Unrealized Gains		12,359	25,689
Gross Unrealized Losses		(4,950)	(2,938)
Estimated Fair Value		106,666	122,048
Other Invested Assets
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		31,137	33,174
Gross Unrealized Gains		2,418	489
Estimated Fair Value		33,555	33,663
Fixed Maturities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		1,539,192	1,272,948
Gross Unrealized Gains		13,277	14,488
Gross Unrealized Losses		(3,584)	(3,961)
Estimated Fair Value		1,548,885	1,283,475
Other than temporary impairments recognized in AOCI	[1]	(10)	(17)
Fixed Maturities | U.S. Treasury and Agency Obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		95,312	78,569
Gross Unrealized Gains		1,972	2,281
Gross Unrealized Losses		(9)	(83)
Estimated Fair Value		97,275	80,767
Fixed Maturities | Obligations of States and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		232,532	188,452
Gross Unrealized Gains		3,538	3,718
Gross Unrealized Losses		(670)	(697)
Estimated Fair Value		235,400	191,473
Fixed Maturities | Mortgage Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		185,359	205,814
Gross Unrealized Gains		3,203	3,709
Gross Unrealized Losses		(159)	(764)
Estimated Fair Value		188,403	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		278,059	177,853
Gross Unrealized Gains		1,391	713
Gross Unrealized Losses		(616)	(303)
Estimated Fair Value		278,834	178,263
Other than temporary impairments recognized in AOCI	[1]	(10)	(13)
Fixed Maturities | Commercial Mortgage-Backed Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		160,829	133,984
Gross Unrealized Gains		74	21
Gross Unrealized Losses		(827)	(847)
Estimated Fair Value		160,076	133,158
Fixed Maturities | Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		459,840	380,704
Gross Unrealized Gains		2,526	3,421
Gross Unrealized Losses		(1,072)	(709)
Estimated Fair Value		461,294	383,416
Fixed Maturities | Foreign Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		127,261	107,572
Gross Unrealized Gains		573	625
Gross Unrealized Losses		(231)	(558)
Estimated Fair Value		$ 127,603	$ 107,639
[1] Represents the total amount of other than temporary impairment losses relating to factors other than credit losses recognized in accumulated other comprehensive income ("AOCI").

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