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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	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Business Combinations [Abstract]
Net revenue	$ 643,718us-gaap_BusinessAcquisitionsProFormaRevenue	$ 632,774us-gaap_BusinessAcquisitionsProFormaRevenue
Net income	$ 69,371us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss	$ 68,446us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net income per common share, Basic	$ 0.74us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ 0.69us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Net income per common share, Diluted	$ 0.73us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ 0.68us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
Weighted average common shares, Basic	94,231us-gaap_WeightedAverageBasicSharesOutstandingProForma	99,076us-gaap_WeightedAverageBasicSharesOutstandingProForma
Weighted average common shares, Diluted	95,325us-gaap_ProFormaWeightedAverageSharesOutstandingDiluted	100,696us-gaap_ProFormaWeightedAverageSharesOutstandingDiluted

X

- 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

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X

- 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

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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

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X

- 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

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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.

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- Definition

The weighted average number of shares (units) outstanding in the calculation of pro forma basic 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.

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