Common Shares and Stock-Based Compensation - Summary of Activity Related to Performance Shares and Restricted Stock Units (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013
Performance Shares - Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Unvested, Beginning balance	611,562
Shares, Credited and Granted
Shares, Vested
Shares, Forfeited	(19,173)
Modified to cash-based liability awards	(592,389)
Shares, Unvested, Ending balance		611,562
Weighted-Average Remaining Contractual Term (in years)		2 years 2 months 12 days
Aggregate Intrinsic Value, Beginning balance	$ 9,907
Performance Shares - Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Unvested, Beginning balance	354,464
Shares, Credited and Granted
Shares, Vested
Shares, Forfeited	(354,464)
Shares, Unvested, Ending balance		354,464
Weighted-Average Remaining Contractual Term (in years)		2 years 2 months 12 days
Aggregate Intrinsic Value, Beginning balance	5,742
Restricted Stock Units - Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Unvested, Beginning balance	447,698
Shares, Credited and Granted	277,256
Shares, Vested	(270,487)
Shares, Forfeited	(9,715)
Shares, Settled	(46,470)
Modified to cash-based liability awards	(398,282)
Shares, Unvested, Ending balance		447,698
Weighted-Average Remaining Contractual Term (in years)		7 months 6 days
Aggregate Intrinsic Value, Beginning balance	7,253
Restricted Stock Units - Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Unvested, Beginning balance	117,601
Shares, Credited and Granted	62,636
Shares, Vested	(53,433)
Shares, Forfeited	(126,804)
Shares, Unvested, Ending balance		117,601
Weighted-Average Remaining Contractual Term (in years)		10 months 24 days
Aggregate Intrinsic Value, Beginning balance	$ 1,905