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Acquisition of eSignLive - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
	Nov. 25, 2015	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Provision for income taxes		$ 781		$ 2,351	$ 3,145	$ 6,831
Silanis Technology Inc [Member]
Business Acquisition [Line Items]
Aggregate purchase price	$ 75,000
Decrease in valuation allowance			$ 9,146
Provision for income taxes			$ 311
Purchase price allocation to identifiable intangible assets		$ 30,000			$ 30,000

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-SubTopic 10
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6516133

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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