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Derivatives - Fair Value Measurements on Recurring Basis (Detail) (Series F Agreement [Member], USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value On Recurring Basis [Line Items]    
Fair Value of Liabilities $ (214) $ (826)
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Fair Value On Recurring Basis [Line Items]    
Fair Value of Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)
    
Fair Value On Recurring Basis [Line Items]    
Fair Value of Liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Unobservable Inputs (Level 3)
    
Fair Value On Recurring Basis [Line Items]    
Fair Value of Liabilities $ (214) $ (826)