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Securities - Percentage Vintage, Property Type, and Location of Collateral Securing Company's AAA-Rated CMBS Investments Calculated on Weighted Average Basis (Detail) - Available-for-sale Securities [Member] | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Vintage Concentration Risk [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 100.00% | 100.00%
Vintage Concentration Risk [Member] | Vintage 2005 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 2.50% | 2.00%
Vintage Concentration Risk [Member] | Vintage 2006 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 14.90% | 12.10%
Vintage Concentration Risk [Member] | Vintage 2007 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 67.40% | 73.50%
Vintage Concentration Risk [Member] | Vintage 2008 [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 15.20% | 12.40%
Product Concentration Risk [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 100.00% | 100.00%
Product Concentration Risk [Member] | Office [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 31.70% | 34.60%
Product Concentration Risk [Member] | Retail [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 32.50% | 29.00%
Product Concentration Risk [Member] | Multifamily [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 11.30% | 12.40%
Product Concentration Risk [Member] | Other |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 24.50% | 24.00%
Geographic Concentration Risk [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 100.00% | 100.00%
Geographic Concentration Risk [Member] | South Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 26.70% | 23.80%
Geographic Concentration Risk [Member] | Middle Atlantic [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 15.70% | 16.70%
Geographic Concentration Risk [Member] | Pacific [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 13.90% | 15.30%
Geographic Concentration Risk [Member] | East North Central [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 12.10% | 10.80%
Geographic Concentration Risk [Member] | Other [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Percentage | 31.60% | 33.40%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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