Income Taxes - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Sep. 17, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Tax Credit Carryforward [Line Items]
Payments To Civil Penalty	$ 3,700,000
Effective Income Tax Rate Reconciliation, Tax Credits		35.10%	33.00%	38.10%
Federal capital loss carry forwards		287,000
Capital loss carryforward term		5 years
Operating loss carry forwards net		5,400,000
Operating loss carryforwards, expiration dates		2031
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		293,000
Credit carry forwards, net		$ 29,000
Credit carryforward, expiration date		Dec. 31, 2017
Minimum
Tax Credit Carryforward [Line Items]
Capital loss carryforwards, expiration year		2014
Maximum
Tax Credit Carryforward [Line Items]
Capital loss carryforwards, expiration year		2017