Segment Information - General Corporate Expenses and Other Business Operations, Net (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Selling, general and administrative:
Total selling, general and administrative	$ (112,288)	$ (98,405)	$ (95,237)
Other expense	(3,595)	(4,885)	(5,674)
Operating income (loss)	(50,752)	53,362	105,308
Corporate [Member]
Selling, general and administrative:
Personnel costs	(14,798)	(8,434)	(8,096)
Fees and expenses relating to shareholders'	(4,603)	(4,843)	(162)
Professional fees	(6,610)	(4,536)	(4,813)
All other	(3,979)	(3,632)	(2,046)
Total selling, general and administrative	(29,990)	(21,445)	(15,117)
Other income	128	97	584
Other expense	(55)	(17)	(28)
Operating income (loss)	$ (29,917)	$ (21,365)	$ (14,561)