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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]	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Vintage Concentration Risk [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage	100.00%	100.00%
Vintage Concentration Risk [Member] | 2005 [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage	0.00%	2.00%
Vintage Concentration Risk [Member] | 2006 [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage	21.20%	12.10%
Vintage Concentration Risk [Member] | 2007 [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage	57.00%	73.50%
Vintage Concentration Risk [Member] | 2008 [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage	21.80%	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	37.80%	34.60%
Product Concentration Risk [Member] | Retail [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage	25.80%	29.00%
Product Concentration Risk [Member] | Multifamily [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage	13.60%	12.40%
Product Concentration Risk [Member] | Other [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage	22.80%	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	28.30%	23.80%
Geographic Concentration Risk [Member] | Middle Atlantic [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage	11.90%	16.70%
Geographic Concentration Risk [Member] | Pacific [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage	5.80%	15.30%
Geographic Concentration Risk [Member] | East North Central [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage	16.70%	10.80%
Geographic Concentration Risk [Member] | Other [Member]
Mortgage Loans on Real Estate [Line Items]
Percentage	37.30%	33.40%

X

- 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=84177426&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=77997519&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=84177426&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=77997519&loc=d3e13537-108611

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- Definition

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