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Components of Net Realized Investment Gains (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Total net realized investment gains (losses) | $ 6,532 | $ 39,881 | $ 3,562 | $ 39,068
Not Designated as Hedging Instrument | Interest Rate Swap |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross realized gains | 6,353 |  | 1,873 |
Gross realized losses | (1,296) | (6,018) | (2,698) | (12,360)
Total net realized investment gains (losses) | 5,057 | (6,018) | (825) | (12,360)
Fixed Maturities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross realized gains | 746 | 719 | 1,479 | 2,389
Gross realized losses | (110) | (96) | (241) | (226)
Total net realized investment gains (losses) | 636 | 623 | 1,238 | 2,163
Common Shares |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross realized gains | 3,371 | 45,868 | 5,923 | 49,875
Gross realized losses | (2,532) | (592) | (2,870) | (610)
Total net realized investment gains (losses) | $ 839 | $ 45,276 | 3,053 | $ 49,265
Preferred Stock |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross realized gains |  |  | 96 |
Total net realized investment gains (losses) |  |  | $ 96 |

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