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Net Income Per Share - Summary of Table Reconciling Basic and Diluted Net Income Per Share (Parenthetical) (Detail)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities were not included in the computation of net income per diluted share 1,294 3,113 1,202 3,106
Restricted Stock [Member]
       
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities were not included in the computation of net income per diluted share 0   0  
Restricted Stock Unit [Member]
       
Dilutive Securities Included And Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities were not included in the computation of net income per diluted share   0   1