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Long Term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term debt including current portion $ 110,600 $ 96,600
Current portion of long-term obligations (20,000) (5,000)
Unamortized Debt Issuance Expense (3,200) (3,400)
Total 90,600 91,600
One Hundred Million Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt including current portion 98,800 100,000
Two Hundred Million Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt including current portion $ 15,000 $ 0