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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, 2020	Nov. 30, 2020	Oct. 31, 2020	Sep. 30, 2020	Aug. 31, 2020	Jul. 31, 2020	Jun. 30, 2020	May 31, 2020	Apr. 30, 2020	Feb. 28, 2020	Jan. 31, 2020	Dec. 31, 2020	Mar. 31, 2020
Equity Class Of Treasury Stock [Line Items]
Total Number of Shares Purchased	68,433	1,883	435	126	123	1,647	389	1,318	2,171	2,571	69,146	148,242
Average Price Paid Per Share	$ 55.58	$ 50.23	$ 52.72	$ 51.74	$ 54.54	$ 50.15	$ 47.01	$ 42.80	$ 46.20	$ 54.41	$ 52.49	$ 53.70
Maximum Value of Shares that May Yet Be Purchased Under the Plan	$ 75,002	$ 75,002	$ 75,002	$ 75,002	$ 75,002	$ 75,002	$ 75,002	$ 75,002	$ 75,002	$ 75,002	$ 75,002	$ 75,002	$ 75,002

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Amount remaining of a stock repurchase plan authorized.

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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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-Name Accounting Standards Codification
-Topic 505
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-Section S99
-Paragraph 1
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