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Acquisitions - Summary of Unaudited Pro Forma Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Combinations [Abstract]
Net revenues	$ 1,291,771us-gaap_BusinessAcquisitionsProFormaRevenue	$ 1,255,376us-gaap_BusinessAcquisitionsProFormaRevenue	$ 1,225,958us-gaap_BusinessAcquisitionsProFormaRevenue
Net income applicable to common stock	$ 256,785us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss	$ 40,725us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss	$ 12,098us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Net income per common share - basic	$ 2.70us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ 0.43us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic	$ 0.13us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Net income per common share - diluted	$ 2.69us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ 0.43us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted	$ 0.13us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted

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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- 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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- 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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