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Shared-based Compensation (Summary of Restricted Stock Activity) (Detail) - Restricted Stock [Member]
shares in Thousands
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Shares  
Unvested at December 31, 2015 | shares 264
Granted | shares 17
Vested | shares (65)
Forfeited | shares (39)
Unvested at September 30, 2016 | shares 177
Weighted-Average Grant Date Fair Value  
Unvested at December 31, 2015 | $ / shares $ 26.38
Granted | $ / shares 28.35
Vested | $ / shares 25.14
Forfeited | $ / shares 26.43
Unvested at September 30, 2016 | $ / shares $ 27.02