Quarterly report pursuant to Section 13 or 15(d)

Summary of Compensation Expense under Share-Based Payment Arrangements and Related Tax Benefit (Detail)

v2.4.0.8
Summary of Compensation Expense under Share-Based Payment Arrangements and Related Tax Benefit (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation $ 3,758 $ 2,255
Tax benefit computed at the statutory rate 1,315 789
Restricted Stock
   
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation 99 99
Restricted Stock Units (RSUs)
   
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation 2,537 2,156
Common Stock
   
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share-based compensation $ 1,122 $ 0