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Summary of PSU Activity of the Incentive Plan (Parenthetical) (Detail) - Performance Share Units	12 Months Ended
	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted based on target award performance period	3 years
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted based on target award percentage	0.00%
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares granted based on target award percentage	150.00%

X

- Definition

Share based compensation arrangement, by share based payment award, number of shares granted based on target award percentage.

+ References

No definition available.

+ Details

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X

- Definition

Share based compensation arrangement by share based payment award number of shares granted based on target award performance period.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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- Details

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