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Earnings Per Share - Additional Information (Detail)	9 Months Ended
Earnings Per Share - Additional Information (Detail)	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Participating securities	463,774	489,381

This element represents nonvested share-based payment awards that contain non-forfeitable rights to dividends or dividend equivalents (whether paid or unpaid). Basic and dilutive earnings per share are generally disclosed for such shares using the two-class method.

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