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Business Acquisitions - Schedule of Pro Forma Information Combines Consolidated Results of Company and Business Acquisitions (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Business Combinations [Abstract] |  |
Net revenue | $ 2,590,384 us-gaap_BusinessAcquisitionsProFormaRevenue | $ 2,494,968 us-gaap_BusinessAcquisitionsProFormaRevenue
Net income | $ 326,216 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | $ 301,076 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net income per common share, Basic | $ 3.31 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic | $ 3.04 us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Net income per common share, Diluted | $ 3.27 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted | $ 2.98 us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
Weighted average common shares, Basic | 98,588 us-gaap_WeightedAverageBasicSharesOutstandingProForma | 99,112 us-gaap_WeightedAverageBasicSharesOutstandingProForma
Weighted average common shares, Diluted | 99,887 us-gaap_ProFormaWeightedAverageSharesOutstandingDiluted | 100,969 us-gaap_ProFormaWeightedAverageSharesOutstandingDiluted

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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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- Definition The pro forma diluted 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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- 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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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the 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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- Definition The weighted average number of shares or units and dilutive common stock or unit equivalents outstanding in the calculation of proforma diluted earnings per share (earnings per unit), which is commonly presented in initial public offerings based on the terms of the offering. + References No definition available. + Details
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