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Accretion of Debt Issuance Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Debt Instrument [Line Items]        
Accretion expense $ 243 $ 227 $ 481 $ 450