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Acquisitions - Unaudited Supplemental Proforma Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Combinations [Abstract]
Revenues	$ 1,943,906	$ 2,316,002	$ 5,722,741	$ 6,313,290
Gross profit	236,364	353,021	713,434	920,610
Selling, general and administrative expenses	146,224	203,797	447,462	533,555
Amortization of intangible assets	8,694	11,868	26,230	34,745
Net income from continuing operations	46,032	96,598	137,039	235,320
Net income from continuing operations attributable to common stock	$ 43,464	$ 91,231	$ 126,314	$ 221,351
Earnings per share from continuing operations attributable to common stock - basic and diluted	$ 0.23	$ 0.41	$ 0.61	$ 0.99

X

- Definition

The pro forma amortization of intangible assets for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

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- Definition

The pro forma gross profit for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

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X

- Definition

The pro forma net income(loss) attributable to common stock for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

The pro forma selling, general and administrative expenses for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ 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=56956515&loc=d3e1392-128463

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X

- 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=56956515&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=56956515&loc=d3e1392-128463

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- References

No definition available.

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