Annual report pursuant to Section 13 and 15(d)

Computations of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)

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Computations of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share Disclosure [Line Items]      
Shares of unvested restricted stock 1,198 1,406 1,274