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Pro Forma Results of Combined Company Operations (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, Pro Forma Information [Line Items]
Total Revenues	$ 159,441	$ 176,691	$ 329,831	$ 339,074
Net Income	$ 6,550	$ 8,342	$ 6,166	$ 7,242
Income per share
Basic	$ 0.17	$ 0.21	$ 0.16	$ 0.18
Diluted	$ 0.16	$ 0.21	$ 0.15	$ 0.18

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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.

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