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Acquisitions of Businesses and Non-Controlling Interests - Unaudited Proforma Net Revenue and Net Income from Continuing Operations (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Business Combinations [Abstract] |  |
Net revenues | $ 275,511 | $ 261,231
Net income attributable to common shareholders from continuing operations | $ 19,231 | $ 19,894
Earnings per share: |  |
Basic - net income attributable to common shareholders from continuing operations | $ 1.60 | $ 1.69
Diluted - net income attributable to common shareholders from continuing operations | $ 1.59 | $ 1.67
Shares used in computation: |  |
Basic - net income attributable to common shareholders from continuing operations | 12,050 | 11,804
Diluted - net income attributable to common shareholders from continuing operations | 12,069 | 11,904

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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