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Goodwill and Intangibles - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018 USD ($) Acquisition	Jun. 30, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of immaterial acquisitions | Acquisition	1
Goodwill impairment	$ 0	$ 0
Increase in gross carrying amount of intangibles	$ 10,700,000

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- Definition

Number of immaterial acquisitions during period.

+ References

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Amount of increase (decrease) in carrying value of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 350
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