Acquisitions - Unaudited Supplemental to Pro Forma Operating Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition Pro Forma Information [Abstract]
Pro forma revenues	$ 258,575	$ 256,440	$ 520,282	$ 514,007
Pro forma income (loss) from continuing operations	7,946	65,377	(273,961)	56,897
Pro forma net income (loss) attributable to common shareholders	$ 13,170	$ 65,114	$ (250,110)	$ 53,687
Basic earnings per share data:
Net income (loss) attributable to common shareholders	$ 0.04	$ 0.18	$ (0.70)	$ 0.15
Diluted earnings per share data:
Net income (loss) attributable to common shareholders	$ 0.04	$ 0.18	$ (0.70)	$ 0.15

Basic earnings per share data.

No definition available.

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- Definition

Diluted earnings per share data.

+ References

No definition available.

+ Details

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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=56956515&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

+ Details

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- References

No definition available.

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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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- 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

+ Details

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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

+ Details

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