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Debt Securities - Overall Statistics for Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Detail) - Commercial Mortgage Backed Securities [Member] | 9 Months Ended | 12 Months Ended
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Sep. 30, 2016 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |
Coupon | 5.90% | 5.90%
Yield | 5.90% | 6.50%
RemainingWeighted Average Life | 2 years | 1 year 7 months 6 days

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- Definition Available-for-sale Debt Securities, Weighted Average Expected Term + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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