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Basic and Diluted Earnings Per Share - Shares Excluded From Computation of Diluted earnings Per Share (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Shares 15,220,785 15,044,514 7,321,670