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Segment Information - General Corporate Expenses and Other Business Operations, Net (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Selling, general and administrative:        
Total selling, general and administrative $ (25,208) $ (25,069) $ (77,364) $ (74,685)
Other expense (467) (951) (3,794) (4,707)
Operating income (loss) (1,197) 23,143 48,428 35,131
Corporate [Member]
       
Selling, general and administrative:        
Personnel costs (2,134) (1,899) (6,478) (6,194)
Fees and expenses relating to certain activist shareholders' proposals       (4,163)   
Professional fees (1,185) (1,222) (3,333) (3,431)
All other (1,145) (404) (3,162) (1,634)
Total selling, general and administrative (4,464) (3,525) (17,136) (11,259)
Other income 19 3 69 587
Other expense (14) (6) (14) (41)
Operating income (loss) $ (4,459) $ (3,528) $ (17,081) $ (10,713)