Quarterly report pursuant to sections 13 or 15(d)

Investments and Fair Value Measurements - Category of Financial Instruments Not Held at Fair Value (Detail)

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Investments and Fair Value Measurements - Category of Financial Instruments Not Held at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Carrying Amount | Cash
    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets $ 25,055 $ 12,392
Carrying Amount | Restricted Certificates of Deposit and Escrow | Level I
    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets 1,078 1,020
Carrying Amount | Notes Payable | Level II
    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial liabilities 9,715 3,315
Fair Value | Cash
    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets 25,055 12,392
Fair Value | Restricted Certificates of Deposit and Escrow | Level I
    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets 1,078 1,020
Fair Value | Notes Payable | Level II
    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial liabilities $ 9,715 $ 3,315