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Segment Information - General Corporate Expenses and Other Business Operations, Net (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information [Line Items]        
Gross profit-Other $ 38,659 $ 65,735 $ 64,081 $ 110,179
Selling, general and administrative:        
Total selling, general and administrative (25,125) (22,886) (49,616) (44,277)
Other income 583 112 1,545 348
Other expense (1,726) (555) (3,756) (722)
Operating income 12,225 42,323 11,988 65,405
Other [Member]
       
Segment Reporting Information [Line Items]        
Gross profit-Other 1,161 1,246 2,190 2,246
Selling, general and administrative:        
Personnel costs (3,079) (3,448) (5,189) (5,530)
Professional fees (786) (965) (2,210) (2,369)
All other (870) (979) (1,774) (1,782)
Total selling, general and administrative (4,735) (5,392) (9,173) (9,681)
Other income (7) 9 587 195
Other expense (35)   (35)  
Operating income $ (3,616) $ (4,137) $ (6,431) $ (7,240)