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Stock-Based Compensation - Summary of Activity for Outstanding and Exercisable SARs (Detail) - Stock Appreciation Rights (SARs) [Member]	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
SARs outstanding and exercisable | shares	177,538
SARs outstanding and exercisable | $ / shares	$ 28.52
SARs outstanding and exercisable	2 years 4 months 24 days
SARs outstanding and exercisable | $	$ 6,408

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding and Exercisable.

+ References

No definition available.

+ Details

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other than Options Outstanding and Exercisable Weighted Average Base Value.

+ References

No definition available.

+ Details

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding and Exercisable Weighted Average Remaining Contractual Terms Expected To Vest.

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding and Exercisable

+ References

No definition available.

+ Details

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- 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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