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Employee Benefits - Summary of Equity-Based Awards for Employees (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Awards
Share-based awards granted (in shares)	200,000	100,000	100,000
Common Stock Awards
Awards
Nonvested common stock awards, Beginning balance (in shares)	152,882
Granted (in shares)	174,445
Vested (in shares)	(90,870)
Forfeited/Cancelled (in shares)	(5,177)
Nonvested common stock awards, Ending balance (in shares)	231,280	152,882
Weighted Average Grant Date Fair Value Per Share
Nonvested common stock awards, Beginning balance (in USD per share)	$ 52.93
Granted (in USD per share)	44.56
Vested (in USD per share)	49.69
Forfeited/Cancelled (in USD per share)	45.94
Nonvested common stock awards, Ending balance (in USD per share)	$ 48.05	$ 52.93
Performance-Based Stock Awards
Awards
Nonvested performance-based stock awards/units, Beginning balance (in shares)	160,289
Share-based awards granted (in shares)	61,174
Vested (in shares)	(54,502)
Forfeited/Cancelled (in shares)	0
Nonvested performance-based stock awards/units, Ending balance (in shares)	166,961	160,289
Weighted Average Grant Date Fair Value Per Share
Nonvested performance-based stock awards/units, Beginning balance (in USD per share)	$ 50.49
Granted (in USD per share)	77.20
Vested (in USD per share)	51.43
Forfeited/Cancelled (in USD per share)	0
Nonvested performance-based stock awards/units, Ending balance (in USD per share)	$ 59.97	$ 50.49
Performance-Based Restricted Stock Units
Awards
Nonvested performance-based stock awards/units, Beginning balance (in shares)	13,186
Share-based awards granted (in shares)	13,655
Vested (in shares)	(13,077)
Forfeited/Cancelled (in shares)	(491)
Nonvested performance-based stock awards/units, Ending balance (in shares)	13,273	13,186
Weighted Average Grant Date Fair Value Per Share
Nonvested performance-based stock awards/units, Beginning balance (in USD per share)	$ 51.62
Granted (in USD per share)	36.51
Vested (in USD per share)	51.50
Forfeited/Cancelled (in USD per share)	42.94
Nonvested performance-based stock awards/units, Ending balance (in USD per share)	$ 36.51	$ 51.62

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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