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Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill (Gross), beginning balance	$ 225,470
Business Combinations	11,771
Other	501
Goodwill (Gross), ending balance	237,742
Accumulated Impairment Losses, beginning balance	(70,004)
Accumulated Impairment Losses, ending balance	(70,004)
Goodwill (Net), beginning balance	155,466
Business Combinations	11,771
Other	501
Goodwill (Net), ending balance	$ 167,738

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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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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