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Summarized Financial Information for Equity Method Investee Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]    
Current assets $ 38,317 $ 56,859
Noncurrent assets 3,991 32,690
Total assets 42,308 89,549
Current liabilities 37,940 38,108
Noncurrent liabilities 443 635
Total liabilities $ 38,383 $ 38,743