Increase (Decrease) in Carrying Amount of Value of Business Acquired (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Business Acquisition, Acquisition Related Costs [Line Items]
Adjustment related to realized (gains) losses on investments	$ 11,774	$ 31
Adjustment related to unrealized (gains) losses and OTTI on investments	(8,784)	871
VOBA
Business Acquisition, Acquisition Related Costs [Line Items]
Accretion (amortization) expense	(2,865)	(2,227)
Unlocking	(54)	(137)
Adjustment related to realized (gains) losses on investments	(73)	(104)
Adjustment related to unrealized (gains) losses and OTTI on investments	8,784	(871)
Increase (decrease) in VOBA carrying amount	$ 5,792	$ (3,339)

Accretion (amortization) Value of Business Acquired (VOBA) expense.

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- Definition

Business Acquisition, Acquisition Related Costs [Line Items]

+ References

No definition available.

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- Definition

Amount of value of business acquired allocated to other comprehensive income (loss).

+ References

No definition available.

+ Details

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- Definition

Amount of increase (decrease) in the asset representing the present value of future profits.

+ References

No definition available.

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- Definition

The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.3(a))
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 325
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=75031664&loc=d3e22529-158502

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- Definition

Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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