Goodwill and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Nov. 30, 2013	Feb. 28, 2013
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	7 years 2 months 12 days	6 years 2 months 12 days
Gross Carrying Amount	$ 60,544	$ 39,894
Accumulated Amortization	21,936	19,121
Amortized intangible assets, net	38,608	20,773
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	0 years	0 years
Gross Carrying Amount	1,234	1,234
Accumulated Amortization	1,234	1,234
Amortized intangible assets, net
Customer lists [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	7 years 2 months 12 days	6 years 4 months 24 days
Gross Carrying Amount	58,537	37,887
Accumulated Amortization	20,472	17,753
Amortized intangible assets, net	38,065	20,134
Patent [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	4 years 2 months 12 days	5 years
Gross Carrying Amount	773	773
Accumulated Amortization	230	134
Amortized intangible assets, net	$ 543	$ 639