Computation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	May 31, 2014	May 31, 2013	May 31, 2014	May 31, 2013
Numerator:
Net (loss) income	$ 21,469	$ 22,440	$ 41,364	$ 35,953
Denominator:
Weighted average shares outstanding	46,535,179	46,446,993	46,525,303	46,435,289
Effect of dilutive securities	13,664	17,058	14,243	15,278
Diluted weighted average shares outstanding	46,548,843	46,464,051	46,539,546	46,450,567
Basic and diluted earnings per share
Basic and diluted earnings per share	$ 0.46	$ 0.48	$ 0.89	$ 0.77
Anti-dilutive shares excluded in the computation of diluted earnings per share	126,116	215,246	131,251	219,699