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Business Acquisitions and Dispositions - Summary of Consolidated Pro Forma Results of Future Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Business Combinations [Abstract] |  |
Total revenues | $ 8,945,740 | $ 8,531,424
Gross profit | 1,318,320 | 1,261,954
Income from continuing operations before taxes | 129,588 | 142,766
Net income from continuing operations | $ 85,024 | $ 92,197
Diluted earnings per share from continuing operations | $ 1.59 | $ 1.58

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- Definition The pro forma net Income or Loss for the 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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