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General - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of operating segments	1
Number of Reportable segment	1
Trade receivables | $	$ 200,479	$ 181,368
Credit Concentration Risk | Revenue
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of revenue derived from distribution channels	37.00%	38.00%	37.00%
Credit Concentration Risk | Revenue | First Channel Partner
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Percentage of revenue derived from distribution channels	19.00%	20.00%	21.00%
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%	16.00%

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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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