Debt - Additional Information (Detail) (USD $)			12 Months Ended				12 Months Ended						12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Interest Rate Swap Hedge	Dec. 31, 2012 Procurian term loan	Dec. 31, 2012 PNC Bank Revolving Credit Facility	Dec. 31, 2012 PNC Bank Letter of Credit	Dec. 31, 2012 PNC Bank Interest Rate Swap Hedge	Dec. 31, 2012 PNC Bank Procurian term loan	Dec. 31, 2012 PNC Bank Procurian term loan Minimum	Dec. 31, 2012 PNC Bank Procurian term loan Maximum	Dec. 31, 2012 Venture Bank	Nov. 30, 2012 Venture Bank	Dec. 31, 2012 Venture Bank Minimum	Nov. 30, 2012 Venture Bank Revolving Credit Facility	Dec. 31, 2012 Venture Bank Term Loan Credit Facilty	Nov. 30, 2012 Venture Bank Term Loan Credit Facilty	Dec. 31, 2012 Horizon	Oct. 22, 2012 Horizon
Line of Credit Facility [Line Items]
Long-term debt	$ 27,978,000	$ 10,681,000
Extended date of mature, before					Aug. 02, 2015
Line of credit facility, unused capacity, commitment fee					0.25%
Line of credit	25,000,000				15,000,000	5,000,000						4,500,000		2,000,000		2,500,000		5,000,000
Balance term loan	13,000,000
Additional borrowing entitled	12,000,000
Federal fund open rate								Federal Funds Open Rates plus 0.5%
Federal fund open rate percentage								0.50%
Debt instrument basis spread on variable rate sum of daily LIBOR rate								Sum of the daily LIBOR rate plus 1.0%
Daily LIBOR rate percentage								1.00%
Debt instrument basis spread on variable rate daily to six month LIBOR rate								Daily to six month LIBOR rate plus a margin ranging from 1.5% to 2.0%
Six Month LIBOR rate percentage									2.00%	1.50%
Line of credit facility, periodic payment, principal								400,000
Annual interest rate								Monthly
Effective interest rate being paid				1.96%
Term loan was effectively converted to a fixed interest rate							50.00%
Term loan was effectively converted to a fixed interest fate interest rate							1.34%
Interest rate swap hedge agreement			10,000,000
Aggregate amount of loan																		10,000,000
Term loan agreement																		5,000,000
Fair value of line of credit																		9,800,000
Loan interest rate																	11.65%
Loans maturity date											Nov. 30, 2017						May 01, 2016
Prime rate											Prime rate plus 2.0%
Prime rate percentage											2.00%		5.50%
Loan outstanding															$ 2,500,000