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Research and Development Costs - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Schedule Of Research And Development [Line Items] |  |
Research and development costs related to software development | $ 5.9us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost | $ 4.5us-gaap_ResearchAndDevelopmentExpenseSoftwareExcludingAcquiredInProcessCost

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- Definition Research and development expense during the period related to the costs of developing and achieving technological feasibility of a computer software product to be sold, leased, or otherwise marketed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Research and Development -URI http://asc.fasb.org/extlink&oid=6523717 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preliminary Project Stage -URI http://asc.fasb.org/extlink&oid=6521637 + Details
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