Annual report pursuant to Section 13 and 15(d)

Investments in and Advances to Affiliate (Parenthetical) (Detail)

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Investments in and Advances to Affiliate (Parenthetical) (Detail)
Dec. 31, 2012
Dec. 31, 2011
Investments in and Advances to Affiliates [Line Items]    
Percentage of investment interest 14.00% 14.00%