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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost for defined contribution plan.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of tax benefit from exercise of option under share-based payment arrangement.

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Amount of obligations incurred for employer-related costs classified as other, payable within one year or the normal operating cycle, if longer.

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Amount of labor-related expenses classified as other.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

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

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The number of grants made 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Employee Benefits - Additional Information (Detail) - USD ($)			12 Months Ended
	Apr. 23, 2013	Apr. 22, 2013	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 24, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accrued contributions related to discretionary noncontributory profit sharing plan			$ 2,000,000.0
Contributions paid related to discretionary noncontributory profit sharing plan				$ 2,000,000.0	$ 1,500,000
Recognized matching contribution expense			$ 11,000,000.0	10,600,000	8,800,000
Long-Term Incentive Compensation Plan (LTIP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost is expected to be recognized, (in years)			1 month 6 days
Total intrinsic value of options exercised			$ 2,000,000.0	1,600,000	6,100,000
Cash received from options exercised			4,600,000	3,800,000	11,300,000
Tax benefit realized for stock options exercised			345,000	766,000	2,400,000
Long-Term Incentive Compensation Plan (LTIP) [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock reserved	7,440,000	5,250,000
Benefits received by eligible employee	$ 2,000,000	$ 1,000,000
Omnibus Incentive Compensation Plan (OICP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of stock reserved						5,400,000
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized expense			600,000	1,300,000	1,500,000
Unrecognized compensation expense				46,000
Employee Stock Option [Member] \| Long-Term Incentive Compensation Plan (LTIP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense			46,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized expense			3,400,000	6,900,000	8,200,000
Unrecognized compensation expense				2,200,000
Restricted Stock [Member] \| Omnibus Incentive Compensation Plan (OICP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of shares vested					18,000
Unrecognized compensation expense			0	0	0
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized expense			10,500,000	$ 6,000,000.0	807,000
Unrecognized compensation expense			$ 13,300,000
Service Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding			66,298	210,538
Cancelled			7,345
Vested			136,895
Service Based Restricted Stock [Member] \| After Three Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			75% after three years of service
Service Based Restricted Stock [Member] \| After Three Years [Member] \| Prior to Twenty Sixteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			50% of the shares vest after three years of service
Service Based Restricted Stock [Member] \| After Four Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			100% after four years of service
Service Based Restricted Stock [Member] \| After Four Years [Member] \| Prior to Twenty Sixteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			75% after four years of service
Service Based Restricted Stock [Member] \| After Five Years [Member] \| Prior to Twenty Sixteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			100% after five years of service
Service Based Restricted Stock [Member] \| After Two Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			50% of the shares vest after two years of service
Service Based Restricted Stock [Member] \| Long-Term Incentive Compensation Plan (LTIP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense				$ 2,200,000
Cost is expected to be recognized, (in years)			1 year
Total fair value of shares vested			$ 9,200,000	$ 8,700,000	$ 14,500,000
Service Based Restricted Stock [Member] \| Omnibus Incentive Compensation Plan (OICP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost is expected to be recognized, (in years)			2 years 8 months 12 days
Total fair value of shares vested			$ 300,000
Unrecognized compensation expense			$ 10,700,000
Outstanding			0
Granted			0
Cancelled			0
Vested			0	0	0
Service Based Restricted Stock [Member] \| Omnibus Incentive Compensation Plan (OICP) [Member] \| After Three Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			50% vest after three years of service
Service Based Restricted Stock [Member] \| Omnibus Incentive Compensation Plan (OICP) [Member] \| After Three Years [Member] \| With in Four-Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			75% are vested after three years
Service Based Restricted Stock [Member] \| Omnibus Incentive Compensation Plan (OICP) [Member] \| After Four Years [Member] \| With in Four-Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			100% are vested after four years
Service Based Restricted Stock [Member] \| Omnibus Incentive Compensation Plan (OICP) [Member] \| After Two Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			50% of the units vest after two years of service
Service Based Restricted Stock [Member] \| Omnibus Incentive Compensation Plan (OICP) [Member] \| After Two Years [Member] \| With in Four-Year [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			50% of the units are vested after two years
Performance Based Restricted Stock Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance requirement period			3 years
Outstanding				30,545
Vested			30,545
Performance Based Restricted Stock Unit [Member] \| Long-Term Incentive Compensation Plan (LTIP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total fair value of shares vested			$ 2,000,000.0	$ 3,000,000.0	$ 2,600,000
Performance Based Restricted Stock Unit [Member] \| Omnibus Incentive Compensation Plan (OICP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cost is expected to be recognized, (in years)			1 year 9 months 18 days
Unrecognized compensation expense			$ 2,600,000
Outstanding			148,073	84,886
Granted			65,093
Cancelled			1,906
Vested			0	0	0
Nonqualified Stock Option Plan [Member] \| Long-Term Incentive Compensation Plan (LTIP) [Member] \| After Three Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			75% after three years
Nonqualified Stock Option Plan [Member] \| Long-Term Incentive Compensation Plan (LTIP) [Member] \| After Three Years [Member] \| Prior to Twenty Sixteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			50% after three years
Nonqualified Stock Option Plan [Member] \| Long-Term Incentive Compensation Plan (LTIP) [Member] \| After Four Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			100% after four years
Nonqualified Stock Option Plan [Member] \| Long-Term Incentive Compensation Plan (LTIP) [Member] \| After Four Years [Member] \| Prior to Twenty Sixteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			75% after four years
Nonqualified Stock Option Plan [Member] \| Long-Term Incentive Compensation Plan (LTIP) [Member] \| After Five Years [Member] \| Prior to Twenty Sixteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			100% after five years
Nonqualified Stock Option Plan [Member] \| Long-Term Incentive Compensation Plan (LTIP) [Member] \| After Two Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting schedule			50% after two years