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Unvested Restricted Stock-Based Activity (Detail) (Restricted Share Award, USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Restricted Share Award
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, December 31, 2012, Shares 1,312
Restricted stock-based awards granted, Shares 451
Restricted stock-based awards vested, Shares (497)
Restricted stock-based awards forfeited, Shares (22)
Outstanding, December 31, 2013, Shares 1,244
Outstanding, December 31, 2012, Weighted-Average Grant-Date Fair Value $ 37.43
Restricted stock-based awards granted, Weighted-Average Grant-Date Fair Value $ 37.21
Restricted stock-based awards vested, Weighted-Average Grant-Date Fair Value $ 36.97
Restricted stock-based awards forfeited, Weighted-Average Grant-Date Fair Value $ 60.65
Outstanding, December 31, 2013, Weighted-Average Grant-Date Fair Value $ 37.14