Debt - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 16, 2010	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Debt Instrument [Line Items]
Lines of credit		$ 500,000		$ 500,000		$ 1,000,000
Long-term debt		44,419,000		44,419,000		47,052,000
Lines of credit
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity		8,000,000		8,000,000
Line of credit maturity date		2014-09		2014-09
Lines of credit		500,000		500,000		1,000,000
Line of credit, available borrowing capacity		7,500,000		7,500,000
Debt, interest rate		4.00%		4.00%
Debt, interest expense		23,000	8,000	72,000	70,000
Notes payable
Debt Instrument [Line Items]
Debt, interest expense		800,000	900,000	2,500,000	2,600,000
Debt, interest rate	9.00%
Cash received by TOPrS	39,000,000
Debt, maturity date	2016-12
Debt instrument, acquired	1,800,000
Long-term debt		37,246,000		37,246,000		37,246,000
Term Loan
Debt Instrument [Line Items]
Debt, interest rate		5.00%		5.00%
Debt, interest expense		100,000	100,000	200,000	300,000
Debt, maturity date		2016-09		2016-09
Debt, face amount		8,000,000		8,000,000
Long-term debt		6,000,000		6,000,000		6,900,000
Debt, principal payment, year one		800,000		800,000
Debt, principal payment, year two		1,200,000		1,200,000
Debt, principal payment, year three		1,200,000		1,200,000
Debt, principal payment, year four		1,600,000		1,600,000
Debt, principal payment, year five		1,600,000		1,600,000
Debt, variable interest rate description				The term loan has a variable interest rate based upon the lender’s base rate plus 1.00% per annum; as of September 30, 2013, the interest rate was 5.00%.
Debt, variable interest rate above lender's base rate				1.00%
Seller notes
Debt Instrument [Line Items]
Debt, interest expense		27,000	59,000	100,000	200,000
Debt, interest rate		6.00%		6.00%
Debt, face amount		5,000,000		5,000,000
Long-term debt		1,173,000		1,173,000		2,906,000
Debt, due date				Jan. 29, 2016
Debt, accelerated principal payments due ending year 2013		$ 1,700,000		$ 1,700,000
Debt, interest payment frequency				Quarterly