Annual report pursuant to Section 13 and 15(d)

Summary of Treasury Stock Activity (Parenthetical) (Detail)

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Summary of Treasury Stock Activity (Parenthetical) (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Schedule of Treasury Stock [Line Items]  
Common stock repurchased value as result of restricted stock forfeitures and canceled $ 0.001
Minimum
 
Schedule of Treasury Stock [Line Items]  
Market Value of Restricted Shares $ 22.40
Maximum
 
Schedule of Treasury Stock [Line Items]  
Market Value of Restricted Shares $ 30.23