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Long Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt including current portion $ 100,000 $ 116,400
Current portion of long-term obligations (3,750) (12,000)
Total 96,300 104,400
Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt including current portion 0 33,000
Revolving Credit Facilities [Member]    
Debt Instrument [Line Items]    
Long-term debt including current portion 0 15,000
Second Lien Credit Agreement Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt including current portion 0 70,000
Discount on long-term debt 0 (1,600)
One Hundred Million Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt including current portion $ 100,000 $ 0