Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards expire in 2030		$ 4,800,000
Net operating loss carryforwards, Expiration date one		2030
Net operating loss carryforwards expire in 2031		8,800,000
Net operating loss carryforwards, Expiration date two		2031
Net operating loss carryforwards expire in 2032		9,300,000
Net operating loss carryforwards, Expiration date three		2032
Net deferred tax assets	32,500,000	32,500,000
Projected cumulative tax losses period		2 years
Period for net unrealized pre-acquisition built-in losses		5 years
Expiration period for net unrealized pre-acquisition built-in losses		Oct. 07, 2015
Future utilization of built-in losses	53,000,000	53,000,000
Limited future utilization of built-in losses	1,100,000	1,100,000
Income tax benefit	436,000	436,000
Income tax provision	3,600,000	3,600,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Federal taxable net operating losses		9,300,000
Federal net operating loss carryforwards	22,900,000	22,900,000
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Estimated unrealized built-in losses	8,000,000	8,000,000
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Estimated unrealized built-in losses	$ 9,000,000	$ 9,000,000