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Investments of Insurance Subsidiaries - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Available for sale securities expected maturity of debt securities	5 years 10 months 24 days
Available for sale securities average scheduled maturity	10 years 2 months 12 days

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- Definition

Available-for-sale securities average scheduled maturity period.

+ References

No definition available.

+ Details

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- Definition

Available for sale securities expected maturity of debt securities (in years).

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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