Future Policy Benefits and Other Policyholder Liabilities - Additional Information (Detail)	12 Months Ended
Dec. 31, 2015
Minimum
Interest rate determination of present values, percentage	2.50%
Maximum
Interest rate determination of present values, percentage	6.00%

States the assumed long-term market interest rate used in the determination of the present value of future profits on long-duration contracts acquired in a business combination.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section S99
-Paragraph 2
-Subparagraph (2)
-URI http://asc.fasb.org/extlink&oid=27015749&loc=d3e569990-122904

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration