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Earnings Per Share - Details of Basic and Diluted Earnings Per Share (EPS) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Net income                 $ 67,158 $ 59,379 $ 42,694
Weighted average common shares outstanding used in basic EPS                 43,158 42,851 45,228
Common shares issuable upon exercise of dilutive stock options and PSAs / RSUs                 1,141 821 566
Weighted average common shares outstanding and common share equivalents used in diluted EPS                 44,299 43,672 45,794
Earnings per share                      
Basic                 $ 1.56 $ 1.39 $ 0.94
Diluted $ 0.37 $ 0.77 $ 0.02 $ 0.36 $ 0.16 $ 0.46 $ 0.31 $ 0.43 $ 1.52 $ 1.36 $ 0.93