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Fair Value - Fair Value of Contingently Convertible Series E Units Liability and Preferred Shares Derivative Liability (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]    
Contingently convertible Series E units liability $ 66,938   
Preferred shares derivative liability 28,150   
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]    
Contingently convertible Series E units liability     
Preferred shares derivative liability     
Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]    
Contingently convertible Series E units liability     
Preferred shares derivative liability     
Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value Liabilities Measured On Recurring and Nonrecurring Basis [Line Items]    
Contingently convertible Series E units liability 66,938  
Preferred shares derivative liability $ 28,150