Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Transfers between Level 1 and 2	$ 0	$ 0
Own credit risk	0.35%	0.30%
Long-term forward rate assumption, minimum	25.00%
Long-term forward rate assumption, maximum	30.00%
Market based implied volatility inputs	5 years

Duration of term structure assumption with market-based implied volatility inputs for equity volatility.

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- Definition

Fair Value Assumptions, Expected Volatility Rate, Maximum

+ References

No definition available.

+ Details

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- Definition

Fair Value Assumptions, Expected Volatility Rate, Minimum

+ References

No definition available.

+ Details

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- References

No definition available.

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- Definition

Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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