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Total Revenues Gross Profit and Long Lived Assets Excluding Long Term Deferred Tax Assets (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets
Total revenues	$ 138,145	$ 125,212	$ 120,610	$ 120,576	$ 140,108	$ 129,896	$ 123,142	$ 119,015	$ 504,543	$ 512,161	$ 529,869
Gross profit	113,392	$ 100,823	$ 96,235	$ 97,444	116,820	$ 106,961	$ 99,041	$ 96,192	407,894	419,014	428,761
Long-lived assets	58,726				71,628				58,726	71,628
Domestic
Revenues from External Customers and Long-Lived Assets
Total revenues									292,930	310,972	326,792
Gross profit									233,945	253,234	265,438
Long-lived assets	53,102				67,031				53,102	67,031
EMEA
Revenues from External Customers and Long-Lived Assets
Total revenues									154,567	150,422	153,658
Gross profit									126,147	122,865	121,148
Long-lived assets	4,108				3,256				4,108	3,256
Other Regions
Revenues from External Customers and Long-Lived Assets
Total revenues									57,046	50,767	49,419
Gross profit									47,802	42,915	$ 42,175
Long-lived assets	$ 1,516				$ 1,341				$ 1,516	$ 1,341

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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