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Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Investment fair value changes, net | $ (11,066) | $ (1,788) | $ (30,604) | $ (2,936)
Realized gains (losses), net | 9,884 | 6,316 | 19,422 | 10,622
Total interest expense | 22,444 | 23,008 | 46,394 | 46,969
Other than temporary impairment recognized in AOCI | 2,000 |  | 2,000 |
Net income before provision for income taxes | 41,608 | 29,512 | 53,699 | 38,997
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other than temporary impairment | 3,000 |  | 3,000 |
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Investment fair value changes, net | 305 | 0 | 305 | 0
Realized gains (losses), net | (8,016) | (5,361) | (18,969) | (7,050)
Net income before provision for income taxes | (7,711) | (5,361) | (18,664) | (7,050)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net income before provision for income taxes | 19 | 26 | 37 | 58
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Reclassification out of Accumulated Other Comprehensive Income | Interest rate contract |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Total interest expense | $ 19 | $ 26 | $ 37 | $ 58

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