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
Jun. 30, 2013
Dec. 31, 2012
Carrying Amount [Member] | Cash [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Assets $ 12,699 $ 12,392
Carrying Amount [Member] | Restricted Certificates of Deposit and Escrow [Member] | Level I [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Assets 1,191 1,020
Carrying Amount [Member] | Notes Payable [Member] | Level II [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities 9,606 3,315
Fair Value [Member] | Cash [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Assets 12,699 12,392
Fair Value [Member] | Restricted Certificates of Deposit and Escrow [Member] | Level I [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial Assets 1,191 1,020
Fair Value [Member] | Notes Payable [Member] | Level II [Member]
    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial liabilities $ 9,606 $ 3,315