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Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill (Gross), beginning balance	$ 243,053
Business Combinations	1,882
Other	28
Goodwill (Gross), ending balance	244,963
Accumulated Impairment Losses, beginning balance	(70,004)
Accumulated Impairment Losses, ending balance	(70,004)
Goodwill (Net), beginning balance	173,049
Business Combinations	1,882
Other	28
Goodwill (Net), ending balance	$ 174,959

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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