Acquisitions - Unaudited Supplemental to Pro Forma Operating Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition Pro Forma Information [Abstract]
Pro forma revenues	$ 1,019,646	$ 997,369	$ 906,028
Pro forma income (loss) from continuing operations	8,651	(66,946)	(126,346)
Pro forma net income (loss) attributable to common shareholders	$ 78,829	$ (131,507)	$ (214,789)
Basic earnings per share data:
Net income (loss) attributable to common shareholders	$ 0.22	$ (0.37)	$ (0.62)
Diluted earnings per share data:
Net income (loss) attributable to common shareholders	$ 0.22	$ (0.37)	$ (0.62)

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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

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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

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- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

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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

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

+ References

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