Annual report pursuant to section 13 and 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
Dec. 31, 2013
Dec. 31, 2012
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Investments $ 103 $ 1,980
Maximum financial interest in affiliated investment funds 2.00%