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Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill and intangible assets, net		$ 64,029	$ 64,614	$ 61,044
Certain Distributors
Business Acquisition [Line Items]
Cash consideration	$ 9,500
Net tangible liabilities	1,900
Intangibles acquired	8,200
Goodwill and intangible assets, net	$ 3,200

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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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.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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