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Accretion of Debt Issuance Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Debt Instrument [Line Items]        
Accretion expense $ 195 $ 231 $ 673 $ 681