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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)

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+ 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)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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Total Revenues Gross Profit and Long Lived Assets Excluding Long Term Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets
Total revenues	$ 148,871us-gaap_Revenues	$ 151,202us-gaap_Revenues	$ 141,853us-gaap_Revenues	$ 137,904us-gaap_Revenues	$ 165,881us-gaap_Revenues	$ 141,919us-gaap_Revenues	$ 137,905us-gaap_Revenues	$ 130,183us-gaap_Revenues	$ 579,830us-gaap_Revenues	$ 575,888us-gaap_Revenues	$ 565,724us-gaap_Revenues
Gross profit	117,236us-gaap_GrossProfit	116,249us-gaap_GrossProfit	106,240us-gaap_GrossProfit	104,895us-gaap_GrossProfit	132,912us-gaap_GrossProfit	108,666us-gaap_GrossProfit	101,459us-gaap_GrossProfit	94,282us-gaap_GrossProfit	444,620us-gaap_GrossProfit	437,319us-gaap_GrossProfit	424,648us-gaap_GrossProfit
Long-lived assets	95,272us-gaap_NoncurrentAssets				102,362us-gaap_NoncurrentAssets				95,272us-gaap_NoncurrentAssets	102,362us-gaap_NoncurrentAssets
Domestic
Revenues from External Customers and Long-Lived Assets
Total revenues									341,692	343,073	326,333
Gross profit									261,459	261,134	241,440
Long-lived assets	85,504				89,342				85,504	89,342
EMEA
Revenues from External Customers and Long-Lived Assets
Total revenues									176,774	169,194	177,543
Gross profit									131,790	123,373	133,986
Long-lived assets	5,690				7,111				5,690	7,111
Other Regions
Revenues from External Customers and Long-Lived Assets
Total revenues									61,364	63,621	61,848
Gross profit									51,371	52,812	49,222
Long-lived assets	$ 4,078				$ 5,909				$ 4,078	$ 5,909