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Goodwill and Intangibles - Summary of Change in Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill (Gross), beginning balance	$ 225,470
Business Combinations	7,086
Other	471
Goodwill (Gross), ending balance	233,027
Accumulated Impairment Losses, beginning balance	(70,004)
Accumulated Impairment Losses, ending balance	(70,004)
Goodwill (Net), beginning balance	155,466
Business Combinations	7,086
Other	471
Goodwill (Net), ending balance	$ 163,023

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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