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Acquisitions - Unaudited Supplemental Proforma Results of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Business Combinations [Abstract]
Revenues	$ 1,766,756	$ 1,785,809
Gross profit	271,736	277,641
Selling, general and administrative expenses	174,359	128,020
Amortization of intangible assets	8,326	9,236
Net income	57,675	89,915
Net income attributable to common stock	$ 53,435	$ 85,139
Earnings per share attributable to common stock - basic and diluted	$ 0.24	$ 0.39

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- Definition

Business acquisitions pro forma amortization of intangible assets.

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- Definition

Business acquisitions pro forma gross profit.

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- Definition

Business Acquisitions Pro Forma Net Income Loss From Continuing Operations

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- Definition

Business Acquisitions Pro Forma Net Income Loss From Continuing Operations Attributable To Common Stock

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- Definition

Business acquisitions pro forma selling, general and administrative expenses.

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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)

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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)

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