Earnings Per Share - Schedule of Calculation of Numerator and Denominator in Earnings Per Share (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Numerator:
Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest	$ 16,574	$ (52,459)	$ 56,872	$ (86,159)
Loss attributable to Noncontrolling Interest	18	0	18	0
Income (Loss) from Continuing Operations Attributable to Parent	16,592	(52,459)	56,890	(86,159)
Loss from Discontinued Operations, Net of Taxes	(43,953)	(2,612)	(49,089)	(7,254)
Net income (loss) (in dollars)	$ (27,361)	$ (55,071)	$ 7,801	$ (93,413)
Denominator:
Weighted average basic shares (in shares)	159,574	158,515	159,252	148,861
Add effect of stock equivalents (in shares)	1,868	0	2,031	0
Weighted average diluted shares (in shares)	161,442	158,515	161,283	148,861