Segment Information - Items Not Allocated to Segments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Income (loss) before taxes	$ 36,529		$ 20,958		$ 10,175
Items Not Allocated To Segments [Member]
Segment Reporting Information [Line Items]
Income (loss) before taxes	(57,291)	[1]	(59,261)	[1]	17,963	[1]
Items Not Allocated To Segments [Member] | General and Administrative Expense [Member]
Segment Reporting Information [Line Items]
Income (loss) before taxes	(20,597)		(25,176)		(20,110)
Items Not Allocated To Segments [Member] | Share-based compensation expense [Member]
Segment Reporting Information [Line Items]
Income (loss) before taxes	(16,809)		(14,929)		(7,067)
Items Not Allocated To Segments [Member] | Gain on sale of assets [Member]
Segment Reporting Information [Line Items]
Income (loss) before taxes	0		16		61,784
Items Not Allocated To Segments [Member] | Interest expense [Member]
Segment Reporting Information [Line Items]
Income (loss) before taxes	(20,004)		(19,363)		(17,012)
Items Not Allocated To Segments [Member] | Other corporate non-operating income [Member]
Segment Reporting Information [Line Items]
Income (loss) before taxes	$ 119		$ 191		$ 368

[1] Items not allocated to segments consist of: For the Year 2013 2012 2011 (In thousands)General and administrative expense$(20,597) $(25,176) $(20,110)Share-based compensation expense(16,809) (14,929) (7,067)Gain on sale of assets— 16 61,784Interest expense(20,004) (19,363) (17,012)Other corporate non-operating income119 191 368 $(57,291) $(59,261) $17,963