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Accretion of Debt Issuance Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Debt Instrument [Line Items]        
Accretion expense $ 364 $ 343 $ 722 $ 682