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Net Income Per Share - Reconciliation of Basic and Diluted Net Income Per Share (Detail) (USD $)
In Thousands, except 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
Numerator:                      
Net income $ 20,237 $ 2,458 $ 7,320 $ 5,761 $ 4,109 $ 2,580 $ 18,572 $ 22,768 $ 35,776 $ 48,029 $ 129,731
Denominator:                      
Shares used in net income per common share - basic                 53,061,000 52,686,000 52,169,000
Effect of dilutive securities:                      
Stock options, restricted stock and employee stock purchase plan                 420,000 548,000 678,000
Shares used in net income per common share - diluted                 53,481,000 53,234,000 52,847,000
Net income per common share:                      
Basic $ 0.38 $ 0.05 $ 0.14 $ 0.11 $ 0.08 $ 0.05 $ 0.35 $ 0.43 $ 0.67 $ 0.91 $ 2.49
Diluted $ 0.38 $ 0.05 $ 0.14 $ 0.11 $ 0.08 $ 0.05 $ 0.35 $ 0.43 $ 0.67 $ 0.90 $ 2.45