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Business Combinations - Schedule of Unaudited Pro forma Combined Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
Oct. 31, 2013
Business Combinations [Abstract]        
Revenue $ 141,461 $ 133,726 $ 282,995 $ 264,871
Operating income 10,079 9,759 19,436 19,923
Net income (loss) attributable to common stockholders $ 261 $ (221) $ (28) $ (243)
Basic net income (loss) per common share attributable to common stockholders $ 0.01 $ (0.01) $ 0.00 $ (0.01)
Basic weighted average shares outstanding 40,326 39,821 40,225 39,742
Diluted net income (loss) per common share attributable to common stockholders $ 0.01 $ (0.01) $ 0.00 $ (0.01)
Diluted weighted average shares outstanding 40,542 39,821 40,225 39,742