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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
[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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