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Long Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term debt including current portion $ 93,000 $ 96,600
Current portion of long-term obligations (5,220) (5,000)
Unamortized debt issuance costs 2,700 3,400
Total 87,800 91,600
Promissory Notes [Member]    
Debt Instrument [Line Items]    
Long-term debt including current portion 700 0
One Hundred Million Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt including current portion 95,000 100,000
Two Hundred Million Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt including current portion $ 0 $ 0