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Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill, Gross (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Roll Forward]
Goodwill (Gross), beginning balance	$ 265,656	$ 243,053
Goodwill (Net), beginning balance	195,652	173,049
Business combinations	21,305	22,405
Other	(87)	198
Goodwill (Gross), ending balance	286,874	265,656
Goodwill (Net), ending balance	216,870	195,652
Accumulated Impairment Losses	$ (70,004)	$ (70,004)	$ (70,004)

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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- Definition

Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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