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Basic and Diluted Earnings per Share - Shares Excluded from Computation of Diluted earnings Per Share (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Shares 15,673,784 17,456,059 16,850,941 17,456,059