Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended				3 Months Ended					12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Mar. 31, 2014 Income Before Income Tax	Mar. 31, 2013 Income Before Income Tax	Mar. 31, 2014 Income Tax Provision	Mar. 31, 2013 Income Tax Provision	Mar. 31, 2014 Maximum	Dec. 31, 2013 Sweden	Mar. 31, 2014 Available to Reduce Future Federal Income Taxes
Income Taxes [Line Items]
Income before income taxes	$ 5,398,105	$ 3,622,068			$ 5,398,000	$ 3,622,000
Income tax provision	1,121,002	1,283,832					1,121,000	1,284,000
Expected effective tax rate				20.90%
Discrete items recognized		298,000
Effective tax rate	20.80%	35.45%
Effective statutory tax rate										28.21%
Net operating loss carry forwards											37,633,000
Business tax credit carry forwards											1,520,000
Net operating loss and business tax credit carry forwards expiration date									At various dates through December 2031
Reversed of deferred tax asset valuation allowance			$ 3,021,000