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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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