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Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Realized gains (losses), net | $ 9,538 | $ 4,306
Total interest expense | 23,950 | 23,961
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains on available-for-sale securities |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Realized gains (losses), net | (10,953) | (1,690)
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized losses on interest rate agreements accounted for as cash flow hedges |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Total interest expense | $ 18 | $ 31

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