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NET INCOME PER SHARE Calculations of Basic and Diluted Net Income per Share and Potential Common Shares (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Numerator:                      
Net income $ 16,676 $ 17,294 $ 9,883 $ 5,253 $ 14,553 $ 11,138 $ 9,910 $ 5,008 $ 49,106 $ 40,609 $ 32,428
Weighted Average Number of Shares Outstanding, Basic [Abstract]                      
Denominator for basic net income per share - weighted average common shares outstanding                 41,366 41,665 42,035
Dilutive common equivalent shares:                      
Weighted average stock options (in shares)                 54 122 154
Weighted average restricted stock units (in shares)                 535 535 561
Denominator for diluted net income per share - weighted average shares outstanding                 41,955 42,322 42,750
Net income per share:                      
Basic net income per share (in dollars per share)                 $ 1.19 $ 0.97 $ 0.77
Diluted net income per share (in dollars per share) $ 0.40 $ 0.41 $ 0.24 $ 0.12 $ 0.34 $ 0.26 $ 0.23 $ 0.12 $ 1.17 $ 0.96 $ 0.76