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Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill (Gross), beginning balance	$ 225,470	$ 177,090
Business combinations	17,023	47,727
Other	560	653
Goodwill (Gross), ending balance	243,053	225,470
Accumulated Impairment Losses, beginning balance	(70,004)	(70,004)
Accumulated Impairment Losses, ending balance	(70,004)	(70,004)
Goodwill (Net), beginning balance	155,466	107,086
Business combinations	17,023	47,727
Other	560	653
Business combinations	17,023	47,727
Other	560	653
Goodwill (Net), ending balance	$ 173,049	$ 155,466

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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-Section 45
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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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