Unaudited Pro Forma Consolidated Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Business Acquisition [Line Items]
Total revenues	$ 51,070	$ 48,671	$ 101,287	$ 98,250
Net income	$ 19,672	$ 10,825	$ 39,401	$ 32,133
Net income per share/unit - diluted	$ 0.14	$ 0.08	$ 0.29	$ 0.23

Net Income Loss per share Attributable to Common Stockholder

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- 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

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=7659399&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

+ Details

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