Discontinued Operations - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended			12 Months Ended
	Mar. 31, 2013	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2012	Dec. 31, 2007 Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of earn-out agreements					2
Cumulative cash receipts received under ECU earn-out					$ 150,000,000
Payments received under 5CP earn-out	13,031,000	79,391,000	33,000	11,336,000
Excess cash received under 5CP earn-out		46,290,000
Cash transaction bonus payable		1,303,000		1,134,000
Pretax earnings (loss) from results		$ (540,000)		$ (1,981,000)