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Acquisitions - Additions to Goodwill, Client Lists and Other Intangible Assets Resulting from Acquisitions and Contingent Consideration Earned on Prior Period Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items] |  |
Goodwill | $ 32,094 | $ 7,378
Client Lists [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets acquired | 11,606 | 3,499
Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets acquired | $ 559 | $ 166

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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- Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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