Quarterly report pursuant to Section 13 or 15(d)

Carrying Amounts and Classification of Assets and Liabilities (Detail)

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Carrying Amounts and Classification of Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Current assets $ 931,419 $ 887,351
Noncurrent assets 384,722 394,537
Total assets 1,316,141 1,281,888
Current liabilities 329,578 308,466
Noncurrent liabilities 70,266 80,895
Total liabilities 399,844 389,361
Variable Interest Entity, Primary Beneficiary
    
Organization Consolidation And Presentation Of Financial Statements [Line Items]    
Current assets 13,130 11,287
Noncurrent assets 129,607 132,925
Total assets 142,737 144,212
Current liabilities 61,428 65,608
Noncurrent liabilities 19,984 18,297
Total liabilities $ 81,412 $ 83,905