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Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended
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