Quarterly report pursuant to Section 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
Sep. 30, 2015
Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets, Carrying Amount $ 101,946 $ 99,696
Financial liabilities, Carrying Amount 42,408 46,634
Cash    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets, Carrying Amount 26,080 30,820
Financial Assets, Fair Value 26,080 30,820
Level I | Restricted Certificates of Deposit and Escrow    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets, Carrying Amount 587 586
Financial Assets, Fair Value 587 586
Level II | Notes Payable    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial liabilities, Carrying Amount 5,152 4,124
Financial liabilities, Fair Value $ 5,152 $ 4,124