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Summary of Net Gains Included in Consolidated Statement of Operations for Changes in Fair Value of Derivatives and Periodic net Interest Settlements Under Derivatives (Detail) (Interest Rate Swap, Other Net Realized Investment Gains, USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Interest Rate Swap | Other Net Realized Investment Gains
   
Derivative Instruments, Gain (Loss) [Line Items]    
Net gain (loss) for changes in fair value and net settlements of derivatives $ (1,192) $ (13,552)