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Fair Value of Financial Instruments and Derivatives - Summary of Company's Financial Instruments Accounted for at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total    $ 14,904
Fair Value on a Recurring Basis [Member] | Contingent Value Rights (CVRs) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total    14,904
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total      
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value on a Recurring Basis [Member] | Contingent Value Rights (CVRs) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total      
Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total    14,904
Significant Other Observable Inputs (Level 2) [Member] | Fair Value on a Recurring Basis [Member] | Contingent Value Rights (CVRs) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total    14,904
Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total      
Significant Unobservable Inputs (Level 3) [Member] | Fair Value on a Recurring Basis [Member] | Contingent Value Rights (CVRs) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total