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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
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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)

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- Definition Amount of gain (loss) included in earnings for the period from the increase (decrease) in fair value of interest rate derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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