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General - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of operating segments	1
Number of Reportable segment	1
Trade receivables | $	$ 189,236	$ 200,479
Credit Concentration Risk | Revenue
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of revenue derived from distribution channels	36.00%	37.00%	38.00%
Credit Concentration Risk | Revenue | First Channel Partner
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of revenue derived from distribution channels	18.00%	19.00%	20.00%
Credit Concentration Risk | Revenue | Second Channel Partner
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of revenue derived from distribution channels	18.00%	18.00%	18.00%

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For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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