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Accretion of Debt Issuance Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Debt Instrument [Line Items]        
Accretion expense $ 231 $ 216 $ 681 $ 637