Debt - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 16, 2010	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Debt Instrument [Line Items]
Lines of credit		$ 4,250,000		$ 4,250,000		$ 1,000,000
Long-term debt		45,296,000		45,296,000		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		4,300,000		4,300,000		1,000,000
Line of credit, available borrowing capacity		3,700,000		3,700,000
Debt, interest rate		4.00%		4.00%
Debt, interest expense		40,000	28,000	49,000	63,000
Seller notes
Debt Instrument [Line Items]
Debt, interest expense		35,000	66,000	100,000	100,000
Debt, interest rate		6.00%		6.00%
Debt, face amount		5,000,000		5,000,000
Long-term debt		1,750,000		1,750,000		2,906,000
Debt, due date				Jan. 29, 2016
Debt, first principal payment date		2012-12		2012-12
Debt, accelerated principal payments due ending year 2013		1,700,000		1,700,000
Debt, interest payment frequency				Quarterly
Notes payable
Debt Instrument [Line Items]
Debt, interest expense		800,000	900,000	1,700,000	1,700,000
Cash received by TOPrS	39,000,000
Debt, interest rate	9.00%
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	200,000
Debt, maturity date		2016-09		2016-09
Debt, face amount		8,000,000		8,000,000
Long-term debt		6,300,000		6,300,000		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 June 30, 2013, the interest rate was 5.00%.
Debt, variable interest rate above lender's base rate				1.00%