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Subsequent Events - Additional Information (Detail) - Jeffrey M. Platt - Subsequent Event $ in Thousands	Oct. 15, 2017 USD ($)
Subsequent Event [Line Items]
Settlement of distribution	$ 1,220
Supplemental executive retirement plan obligation settlement payable	$ 9,600
Supplemental executive retirement plan obligation settlement date	2018-04
Estimated supplemental savings plan obligation settlement payable	$ 1,100
Estimated benefit plan gain (loss) due to settlements	$ 500

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- Definition

Estimated benefit plan gain (loss) due to settlements.

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No definition available.

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- Definition

Estimated supplemental savings plan obligation settlement payable.

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No definition available.

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- Definition

Supplemental executive retirement plan obligation settlement date.

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No definition available.

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- Definition

Supplemental executive retirement plan obligation settlement payable.

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No definition available.

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- Definition

Amount of distribution made to individual in accordance with deferred compensation arrangement.

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No definition available.

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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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No definition available.

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- Details

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- Details

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