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Stock Repurchase Plans - Schedule of Number of Shares Purchased and Maximum Value of Shares that May Yet Be Purchased Under the Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended												12 Months Ended
	Dec. 31, 2021	Nov. 30, 2021	Oct. 31, 2021	Sep. 30, 2021	Aug. 31, 2021	Jul. 31, 2021	Jun. 30, 2021	May 31, 2021	Apr. 30, 2021	Mar. 31, 2021	Feb. 28, 2021	Jan. 31, 2021	Dec. 31, 2021
Equity Class Of Treasury Stock [Line Items]
Total Number of Shares Purchased	62,044	1,700	409	212	53	703	1,117	1,144	968	0	2,630	63,349	134,329
Average Price Paid Per Share	$ 79.18	$ 82.28	$ 77.76	$ 69.85	$ 67.38	$ 65.48	$ 65.24	$ 66.50	$ 66.89	$ 0	$ 56.29	$ 57.00	$ 67.91
Maximum Value of Shares that May Yet Be Purchased Under the Plan	$ 75,002												$ 75,002

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Amount remaining of a stock repurchase plan authorized.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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Number of shares that have been repurchased during the period and are being held in treasury.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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