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Fair Value - Changes in Fair Value of Contingently Convertible Series E Units Liability and Preferred Shares Derivative Liability (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Fair Value Disclosures [Abstract]  
Preferred shares derivative liability, Beginning Balance   
Preferred shares derivative liability, Issuance 26,340
Preferred shares derivative liability, Remeasurement included in earnings 1,810
Preferred shares derivative liability, Ending Balance 28,150
Contingently convertible Series E units liability, Beginning Balance   
Contingently convertible Series E units liability, Issuances 64,881
Contingently convertible Series E units liability, Remeasurement included in earnings 2,057
Contingently convertible Series E units liability, Ending Balance $ 66,938