Long-Term Debt and Short-Term Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 December 20, 2018 [Member]	Sep. 30, 2013 Revolving Credit Facility [Member]	Dec. 31, 2012 Revolving Credit Facility [Member]	Oct. 26, 2012 Revolving Credit Facility [Member]	Sep. 30, 2013 Fixed Rate Notes [Member]	Dec. 31, 2012 Fixed Rate Notes [Member]	Sep. 30, 2013 Minimum [Member]	Sep. 30, 2013 Minimum [Member] October 26th Fixed Rate Debt [Member]	Sep. 30, 2013 Minimum [Member] Revolving Credit Facility [Member]	Sep. 30, 2013 Maximum [Member]	Sep. 30, 2013 Maximum [Member] Revolving Credit Facility [Member]	Sep. 30, 2013 Maximum [Member] Seven Year Fixed Rate Notes [Member] October 26th Fixed Rate Debt [Member]
Line of Credit Facility [Line Items]
Borrowings			$ 100,000		$ 100,000
Applicable margin added to the interest rate post amendment			1.50%							1.25%		2.25%
Method of determining interest rate under revolving credit facility	LIBOR plus an applicable margin
Applicable margin added to the interest rate								2.50%			3.50%
Other notes payable	5,714
Percentage of fixed interest rate bearing pre amendment									5.39%
Percentage of fixed interest rate bearing post amendment													4.89%
Fixed charge coverage ratio current required minimum	1.00
Potential to expand credit facility under credit agreement	35,000
Amount of credit facility to meet short term cash flow needs	10,000
Unamortized balance			1,715	2,012		35	157
Fixed rate notes payable						40,000
Notes Payable		$ 20,000