Debt - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		12 Months Ended	1 Months Ended
	Feb. 29, 2012	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2011 Secured Debt [Member]	Apr. 30, 2013 Second Modification Agreement [Member] Subsequent event [Member]
Line of Credit Facility [Line Items]
Company's eligible accounts receivable		$ 8,000,000			$ 10,000,000
Percentage of eligible accounts receivable		80.00%
Outstanding amounts under the Line of Credit		1.50%
Outstanding borrowings under modification agreement		0	0
Payment under modification agreement	7,000,000
Term loan advances				7,000,000
Percentage of outstanding balance	2.00%
Final payment	$ 140,000,000
Line of Credit maturity date					Mar. 30, 2015