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Debt and Credit Arrangements - Debt and Credit Arrangements (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Short-term debt    
Short-term debt $ 413 $ 1,809
Current portion of long-term debt 110 116
Short-term debt 523 1,925
Long-term debt    
Total long-term debt 31,864 31,865
Total long-term debt 31,864 31,865
Total long-term debt 31,864 31,865
Less current portion (110) (116)
Total long-term debt, less current portion 31,754 31,749
Total debt 32,277 33,674
Australian Dollar Denominated Term Loans Long-term Debt [Member]    
Long-term debt    
Total long-term debt 266 414
Total long-term debt 266 414
Total long-term debt 266 414
USD Denominated Long-term Debt [Member]    
Long-term debt    
Total long-term debt 30,505 31,451
Total long-term debt 30,505 31,451
Total long-term debt 30,505 31,451
Australian Dollar Denominated Secured Notes Short-term Debt [Member]    
Short-term debt    
Short-term debt 112 0
Australian Dollar Denominated Long-term Debt [Member]    
Long-term debt    
Total long-term debt 1,093 0
Total long-term debt 1,093 0
Total long-term debt 1,093 0
Brazilian Real Denominated Secured Notes Short Term Debt [Member]    
Short-term debt    
Short-term debt $ 301 $ 1,809