Long-Term Debt and Short-Term Debt - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Line of Credit Facility [Line Items]
Potential to expand credit facility under credit agreement	$ 35,000
Amount of credit facility to meet short term cash flow needs	10,000
December 20, 2018 [Member]
Line of Credit Facility [Line Items]
Notes payable	20,000
Fixed Rate Notes [Member]
Line of Credit Facility [Line Items]
Unamortized balance	30	34
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowings	100,000
Unamortized balance	$ 1,404	$ 1,617