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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
Jun. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Put option - Redeemable Preferred Stock   $ 490
Total items measured at fair value on a recurring basis 0 81,500
Redeemable Common Stock [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Redeemable Common Stock 0 81,010
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   0
Total items measured at fair value on a recurring basis   0
Quoted prices in active markets Level 1 [Member] | Redeemable Common Stock [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Redeemable Common Stock   0
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   0
Total items measured at fair value on a recurring basis   0
Significant other observable inputs Level 2 [Member] | Redeemable Common Stock [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Redeemable Common Stock   0
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
Total items measured at fair value on a recurring basis   81,500
Significant unobservable inputs Level 3 [Member] | Redeemable Common Stock [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Redeemable Common Stock   $ 81,010