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Schedule of Amortized Cost and Estimated Fair Value of Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 1,414,602 $ 1,382,175
Gross Unrealized Gains 43,210 87,326
Gross Unrealized Losses (7,187) (7,578)
Estimated Fair Value 1,450,625 1,461,923
Other than temporary impairments recognized in AOCI (19) [1] (24) [1]
Common Shares
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 96,084 191,425
Gross Unrealized Gains 26,418 63,281
Gross Unrealized Losses (1,766) (636)
Estimated Fair Value 120,736 254,070
Other Invested Assets
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 21,528 3,065
Gross Unrealized Gains 309 424
Gross Unrealized Losses (719)  
Estimated Fair Value 21,118 3,489
Fixed Maturities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,296,990 1,187,685
Gross Unrealized Gains 16,483 23,621
Gross Unrealized Losses (4,702) (6,942)
Estimated Fair Value 1,308,771 1,204,364
Other than temporary impairments recognized in AOCI (19) [1] (24) [1]
Fixed Maturities | U.S. Treasury and Agency Obligations
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 105,577 78,510
Gross Unrealized Gains 2,506 3,330
Gross Unrealized Losses (122) (166)
Estimated Fair Value 107,961 81,674
Fixed Maturities | Obligations of States and Political Subdivisions
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 193,602 178,705
Gross Unrealized Gains 4,018 4,472
Gross Unrealized Losses (1,174) (2,241)
Estimated Fair Value 196,446 180,936
Fixed Maturities | Mortgage Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 220,398 228,550
Gross Unrealized Gains 3,697 4,219
Gross Unrealized Losses (1,518) (2,859)
Estimated Fair Value 222,577 229,910
Other than temporary impairments recognized in AOCI (4) [1] (5) [1]
Fixed Maturities | Asset-backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 172,988 167,454
Gross Unrealized Gains 738 1,210
Gross Unrealized Losses (419) (228)
Estimated Fair Value 173,307 168,436
Other than temporary impairments recognized in AOCI (15) [1] (19) [1]
Fixed Maturities | Commercial Mortgage-Backed Securities
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 117,976 54,822
Gross Unrealized Gains 29 9
Gross Unrealized Losses (673) (856)
Estimated Fair Value 117,332 53,975
Fixed Maturities | Corporate bonds and loans
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 380,421 426,872
Gross Unrealized Gains 4,703 9,112
Gross Unrealized Losses (579) (592)
Estimated Fair Value 384,545 435,392
Fixed Maturities | Foreign Corporate Bonds
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 106,028 52,772
Gross Unrealized Gains 792 1,269
Gross Unrealized Losses (217)  
Estimated Fair Value $ 106,603 $ 54,041
[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").