Goodwill and Intangible Assets - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended
	Oct. 31, 2010	Mar. 31, 2012 Year	Mar. 31, 2011
Goodwill and Intangible Assets Disclosure [Line Items]
Goodwill impairment loss		$ 0	$ 0
Non-compete agreement
Goodwill and Intangible Assets Disclosure [Line Items]
Contract term	3 years
Amortization period (in years)		3
Amortization expense		117,000	117,000
Customer relationships
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization period (in years)		7
Amortization expense		$ 911,000	$ 911,000