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Acquisitions - Summary of Unaudited Pro Forma Financial Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]
Net revenues	$ 1,212,705	$ 1,135,802	$ 1,099,490
Net income (loss) applicable to common stock	$ 10,118	$ 7,946	$ (39,830)
Net loss per common share - basic	$ 0.11	$ 0.09	$ (0.43)
Net loss per common share - diluted	$ 0.11	$ 0.09	$ (0.43)

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

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