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Summary of Performance Stock Plan Activity (Detail) (Performance Stock Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Performance Stock Plan [Member]
Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Outstanding beginning balance	$ 8.72	$ 8.08	$ 7.32
Weighted-Average Grant Date Fair Value, Granted
Weighted-Average Grant Date Fair Value, Awarded	$ 10.25	$ 8.09	$ 9.56
Weighted-Average Grant Date Fair Value, Vested	$ 4.01	$ 3.29	$ 6.01
Weighted-Average Grant Date Fair Value, Forfeited	$ 8.73	$ 13.06	$ 9.48
Weighted-Average Grant Date Fair Value, Outstanding ending balance	$ 8.62	$ 8.72	$ 8.08
Granted Shares
Granted Shares, Outstanding beginning balance	3,691,022	4,931,812	5,791,854
Granted Shares, Granted
Granted Shares, Awarded
Granted Shares, Vested	(119,364)	(877,224)	(106,490)
Granted Shares, Forfeited	(1,200,371)	(363,566)	(753,552)
Granted Shares, Outstanding ending balance	2,371,287	3,691,022	4,931,812
Awarded Shares
Awarded Shares, Outstanding beginning balance	2,394,505	3,345,269	3,391,519
Awarded Shares, Granted
Awarded Shares, Awarded	122,021	7,743	447,154
Awarded Shares, Vested	(119,364)	(877,224)	(106,490)
Awarded Shares, Forfeited	(101,310)	(81,283)	(386,914)
Awarded Shares, Outstanding ending balance	2,295,852	2,394,505	3,345,269
Shares Not Yet Awarded
Shares Not Yet Awarded, Outstanding beginning balance	1,296,517	1,586,543	2,400,335
Shares Not Yet Awarded, Granted
Shares Not Yet Awarded, Awarded	(122,021)	(7,743)	(447,154)
Shares Not Yet Awarded, Forfeited	(1,099,061)	(282,283)	(366,638)
Shares Not Yet Awarded, Outstanding ending balance	75,435	1,296,517	1,586,543

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Topic 718

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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