Earnings Per Share - Schedule of Calculation of Numerator and Denominator in Earnings Per Share (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Numerator:
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	$ 17,159	$ (37,166)	$ 74,031	$ (123,405)
Loss attributable to Noncontrolling Interest	21	0	39	0
Income (Loss) from Continuing Operations Attributable to Parent	17,180	(37,166)	74,070	(123,405)
Income (Loss) from Discontinued Operations, Net of Taxes	8,093	(692)	(40,996)	(7,866)
Net income (loss) (in dollars)	$ 25,273	$ (37,858)	$ 33,074	$ (131,271)
Denominator:
Weighted average basic shares (in shares)	159,743	158,573	159,416	152,098
Add effect of stock equivalents (in shares)	2,108	0	2,056	0
Weighted average diluted shares (in shares)	161,851	158,573	161,472	152,098