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Reinsurance - Summary of Quota-Share Cession Rates by Reinsurance Program (Detail)	12 Months Ended
	Dec. 31, 2017
June 2014 - May 2015
Quota Share Cession Rate By Reinsurance Program [Line Items]
Percentage of cession rate	30.00%
June 2015 - May 2016
Quota Share Cession Rate By Reinsurance Program [Line Items]
Percentage of cession rate	0.00%
June 2016 - May 2017
Quota Share Cession Rate By Reinsurance Program [Line Items]
Percentage of cession rate	0.00%
June 2017 - May 2018
Quota Share Cession Rate By Reinsurance Program [Line Items]
Percentage of cession rate	0.00%

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- Definition

Quota-share cession rate by reinsurance program and year in effect.

+ References

No definition available.

+ Details

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X

- Definition

Quota share cession rate by reinsurance program.

+ References

No definition available.

+ Details

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- Details

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