Non-Vested Stock Activity (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Shares
Non-vested at beginning of period	7,639,000	7,432,000
Forfeited	(718,000)	(692,000)
Vested	(2,963,000)	(3,000,000)
Non-vested at end of period	13,450,000	8,109,000
Weighted Average Fair Value at Grant Date
Non-vested at beginning of period	$ 10.01	$ 13.85
Forfeited	$ 10.09	$ 13.65
Vested	$ 10.15	$ 14.00
Non-vested at end of period	$ 5.79	$ 10.06
Restricted Stock Awards (RSAs)
Shares
Granted	1,213,000	3,147,000
Weighted Average Fair Value at Grant Date
Granted	$ 4.72	$ 6.88
Restricted Stock Units (RSUs)
Shares
Granted	8,279,000	1,222,000
Weighted Average Fair Value at Grant Date
Granted	$ 3.98	$ 6.89