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Segment Information - General Corporate Expenses and Other Business Operations, Net (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Selling, general and administrative:        
Total selling, general and administrative $ (32,025) $ (24,498) $ (60,216) $ (52,156)
Operating income 2,560 23,764 16,783 49,625
Corporate [Member]        
Selling, general and administrative:        
Personnel costs (4,088) (2,812) (6,690) (4,344)
Fees and expenses relating to shareholders (2,655) (262) (4,334) (4,462)
Professional fees (1,287) (960) (2,831) (2,148)
All other (874) (944) (1,771) (1,718)
Total selling, general and administrative (8,904) (4,978) (15,626) (12,672)
Other income 45 27 69 50
Other expense (3)   (52)  
Operating income $ (8,862) $ (4,951) $ (15,609) $ (12,622)