Quarterly report pursuant to sections 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, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Investments $ 84 $ 1,968
Maximum financial interest in affiliated investment funds 2.00%