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
Jun. 30, 2017
Dec. 31, 2016
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets, Carrying Amount $ 101,606 $ 112,281
Financial liabilities, Carrying Amount 33,221 46,197
Level II | Notes Payable    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial liabilities, Carrying Amount 1,654 2,486
Financial liabilities, Fair Value 1,654 2,486
Investments    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets, Carrying Amount 13 335
Financial Assets, Fair Value 13 335
Cash    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Financial Assets, Carrying Amount 30,015 37,517
Financial Assets, Fair Value $ 30,015 $ 37,517