Components of Gains or Losses on Derivatives Qualifying as Cash Flow Hedges (Detail) - Cash Flow Hedging - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives (Effective Portion)	$ 489	$ 408
Net Realized Gains (Losses) Recognized in Income on Derivatives (Ineffective Portion)	73	1
Net Investment Income
Derivative Instruments Gain (Loss) [Line Items]
Gains (Losses) Reclassified from AOCI into Net Investment Income (Effective Portion)	1,303	(247)
Interest Rate Swap
Derivative Instruments Gain (Loss) [Line Items]
Gains (Losses) Recognized in OCI on Derivatives (Effective Portion)	489	408
Net Realized Gains (Losses) Recognized in Income on Derivatives (Ineffective Portion)	73	1
Interest Rate Swap \| Net Investment Income
Derivative Instruments Gain (Loss) [Line Items]
Gains (Losses) Reclassified from AOCI into Net Investment Income (Effective Portion)	$ 1,303	$ (247)

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1),(2)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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