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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Put option-Redeemable Preferred Stock   $ 490
Redeemable Common Stock   81,010
Total items measured at fair value on a recurring basis    81,500
Quoted prices in active markets Level 1 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Put option-Redeemable Preferred Stock     
Redeemable Common Stock     
Total items measured at fair value on a recurring basis     
Significant other observable inputs Level 2 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Put option-Redeemable Preferred Stock     
Redeemable Common Stock     
Total items measured at fair value on a recurring basis     
Significant unobservable inputs Level 3 [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Put option-Redeemable Preferred Stock   490
Redeemable Common Stock   81,010
Total items measured at fair value on a recurring basis   $ 81,500