Quarterly report pursuant to Section 13 or 15(d)

Investments and Fair Value Measurements - Additional Information (Detail)

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Investments and Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Investments $ 15 $ 1,307
Maximum    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Maximum financial interest in affiliated investment funds 2.00%