Employee Benefit Plans - Additional Information (Detail) (USD $)	9 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Mar. 31, 2011
Minimum
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Defined contribution plan, eligible age of employees			21
Defined Contribution 401 K Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Defined contribution plan, company contribution	$ 102,000	$ 108,000	$ 103,000	$ 108,000
Pension Plans, Defined Benefit | Sweden
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Defined contribution plan, company contribution	$ 10,000		$ 532,000