Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Marketable Securities (Detail)

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Fair Value Measurements - Summary of Marketable Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash, amortized cost and estimated fair value $ 18,244      
Cash and cash equivalents, amortized cost and estimated fair value 251 314    
Restricted cash, amortized cost and estimated fair value 40,614 14,593 18,749 18,075
Amortized Cost 0      
Gross Unrealized Gains 0      
Gross Unrealized Losses 0      
Estimated Fair Value 0      
Corporate bonds and commercial paper [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Amortized Cost 0      
Gross Unrealized Gains 0      
Gross Unrealized Losses 0      
Estimated Fair Value 0      
Money market securities [Member]
       
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Money market securities, amortized cost and estimated fair value 22,370      
Cash and cash equivalents, amortized cost and estimated fair value $ 251