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Computations of Basic and Diluted Earnings Per Share (Parenthetical) (Detail)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Earnings Per Share Disclosure [Line Items]        
Weighted average shares of participating unvested restricted stock 888 1,272 801 1,191