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Shareholders' Equity - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Nov. 01, 2017	Oct. 31, 2017	Aug. 31, 2015	Dec. 31, 2012
Equity [Abstract]
Dividends declared per share (in dollars per share)	$ 3.04	$ 2.96	$ 2.84
Dividends payable	$ 82,315,000	$ 80,038,000	$ 77,800,000
Dividend per share declared (in dollars per share)	$ 0.77	$ 0.75	$ 0.73
Shares authorized under repurchase program							$ 250,000,000.0
Additional authorized amount				$ 250,000,000.0		$ 250,000,000.0
Remaining authorized amended repurchase amount					$ 56,100,000
Remaining authorized repurchase amount	$ 279,700,000			$ 300,000,000.0
Remaining number of shares authorized to be repurchase	2,569,517
Stock repurchased during period as percentage of shares outstanding	2.30%

X

- Definition

Stock Repurchase Program, Additional Authorized Amount

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- Definition

Stock Repurchase Program, Remaining Authorized Amended Repurchase Amount

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- Definition

Stock Repurchased During Period As Percentage Of Shares Outstanding

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
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- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 210
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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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