Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation $ 11,525 $ 12,398 $ 9,710
Tax benefit computed at the statutory rate 4,034 4,339 3,399
Restricted Stock
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation 397 399 2,377
Restricted Stock Units (RSUs)
     
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share-based compensation $ 11,128 $ 11,999 $ 7,333