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Subsequent Events - Additional Information (Detail) - Subsequent Event [Member] - Senior Subordinated Notes [Member] $ in Millions	Nov. 06, 2018 USD ($)
Subsequent Event [Line Items]
Subordinated notes issued	$ 300
Subordinated notes interest rate	5.90%
Interest on the notes	Payable semi-annually in arrears. From November 6, 2023 to November 7, 2028,
Subordinated note maturity date	Nov. 07, 2028
London Interbank Offered Rate (LIBOR) [Member]
Subsequent Event [Line Items]
Description of LIBOR rate	Three-month LIBOR rate plus 278 bps
Basis spread on notes	2.78%

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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