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Segment Information - General Corporate Expenses and Other Business Operations, Net (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information [Line Items]    
Gross profit-Other $ 25,422 $ 44,444
Selling, general and administrative:    
Total selling, general and administrative (24,491) (21,391)
Other income 962 236
Operating income (loss) (237) 23,082
Other [Member]
   
Segment Reporting Information [Line Items]    
Gross profit-Other 1,029 1,000
Selling, general and administrative:    
Personnel costs (2,110) (2,082)
Professional fees (1,424) (1,404)
All other (904) (803)
Total selling, general and administrative (4,438) (4,289)
Other income 594 186
Operating income (loss) $ (2,815) $ (3,103)