Change in Carrying Amount of Deferred Sales Inducements (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
DSI
Capitalization	$ 1	$ 4	$ 3	$ 5
Accretion (amortization) expense	118	(1,172)	(94)	(857)
Unlocking	(4)	(6)	(6)	(12)
Change in DSI carrying amount	$ 115	$ (1,174)	$ (97)	$ (864)

Amortization (accretion) of Deferred Sales Inducements.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

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- Definition

The amount of deferred sales inducement costs capitalized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11332-158416

+ Details

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Balance Type:	debit
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- Definition

Amount of increase (decrease) in deferred sales inducements including, but not limited to, write-offs, dispositions and internal replacements of contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 30
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11332-158416

+ Details

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Period Type:	duration

- Definition

Amount of increase (decrease) in unamortized deferred sales inducement costs.

+ References

+ Details

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