Income Taxes - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012	Mar. 31, 2011
Income Taxes [Line Items]
Deferred tax assets from share-based payments		$ 441,000
Valuation allowance increase and decrease	73,000	(10,169,000)	2,227,000
Cumulative pre-tax income position, Year		3 years
Reversed of deferred tax asset valuation allowance		3,021,000
Earnings of foreign subsidiaries permanently reinvest outside the U.S		477,000
Maximum
Income Taxes [Line Items]
Net operating loss and business tax credit carry forwards expiration date		At various dates through December 2032
Available to Reduce Future Federal Income Taxes
Income Taxes [Line Items]
Net operating loss carry forwards		44,678,000
Business tax credit carry forwards		$ 2,160,000