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)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share Disclosure [Line Items]      
Shares of unvested restricted stock 1,406 1,274 1,076