Goodwill and Intangible Assets - Goodwill / Tradename (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2018	Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill balance, beginning of period	$ 166,951	$ 170,153
Goodwill, divestitures	(14,317)
Goodwill, impairment		(4,443)
Goodwill, foreign currency translation	(272)	1,241
Goodwill balance, end of period	152,362	166,951
Tradename balance, beginning of period	19,691	22,042
Tradename, divestitures	(1,340)
Tradename, impairment		(2,725)
Tradename, foreign currency translation	(65)	374
Tradename balance, end of period	$ 18,286	$ 19,691

Goodwill during period divestitures.

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- Definition

Indefinite lived intangible assets excluding goodwill during period divestitures.

+ References

No definition available.

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- 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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 45
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- References

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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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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.

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- Definition

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

No definition available.

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