Restatement Of Condensed Consolidated Financial Statements (Condensed Consolidated Statements Of Changes In Stockholders' Equity) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011		Dec. 31, 2010		Dec. 31, 2009
Balance	$ 653,929	[1]	$ 1,533,196	[1]	$ 1,685,162
Common Stock [Member]
Balance	728	[1]	708	[1]	694
Treasury Stock [Member]
Balance	(150)	[1]	(150)	[1]	(150)
Additional Paid In Capital [Member]
Balance	1,368,864	[1]	1,343,639	[1]	1,296,391
Accumulated Other Comprehensive Income Of Continuing Operations [Member]
Balance	13,089	[1]	63,499	[1]	82,994
Accumulated Deficit (Retained Earnings) [Member]
Balance	(728,602)	[1]	125,500	[1]	264,917
As Reported [Member]
Balance	700,773		1,564,671
As Reported [Member] | Common Stock [Member]
Balance	728		708
As Reported [Member] | Treasury Stock [Member]
Balance	(150)		(150)
As Reported [Member] | Additional Paid In Capital [Member]
Balance	1,368,864		1,343,639
As Reported [Member] | Accumulated Deficit [Member]
Balance	(675,465)
As Reported [Member] | Accumulated Other Comprehensive Income Of Continuing Operations [Member]
Balance	6,796		60,224
As Reported [Member] | Accumulated Deficit (Retained Earnings) [Member]
Balance			160,250
Adjustment [Member]
Balance	(46,844)		(31,475)
Adjustment [Member] | Common Stock [Member]
Balance	0		0
Adjustment [Member] | Treasury Stock [Member]
Balance	0		0
Adjustment [Member] | Additional Paid In Capital [Member]
Balance	0		0
Adjustment [Member] | Accumulated Deficit [Member]
Balance	(53,137)
Adjustment [Member] | Accumulated Other Comprehensive Income Of Continuing Operations [Member]
Balance	6,293		3,275
Adjustment [Member] | Accumulated Deficit (Retained Earnings) [Member]
Balance			(34,750)
Restated [Member]
Balance	653,929		1,533,196
Restated [Member] | Common Stock [Member]
Balance	728		708
Restated [Member] | Treasury Stock [Member]
Balance	(150)		(150)
Restated [Member] | Additional Paid In Capital [Member]
Balance	1,368,864		1,343,639
Restated [Member] | Accumulated Deficit [Member]
Balance	(728,602)
Restated [Member] | Accumulated Other Comprehensive Income Of Continuing Operations [Member]
Balance	13,089		63,499
Restated [Member] | Accumulated Deficit (Retained Earnings) [Member]
Balance			$ 125,500

[1] Restated