Non-Vested Stock Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Shares
Non-vested at beginning of period	13,142,000	7,639,000	7,432,000
Forfeited	(472,000)	(1,386,000)	(1,102,000)
Vested	(4,733,000)	(3,018,000)	(3,077,000)
Non-vested at end of period	8,554,000	13,142,000	7,639,000
Weighted Average Fair Value at Grant Date
Non-vested at beginning of period	$ 5.58	$ 10.01	$ 13.85
Forfeited	$ 5.41	$ 10.93	$ 12.14
Vested	$ 7.11	$ 5.10	$ 14.07
Non-vested at end of period	$ 4.85	$ 5.58	$ 10.01
Restricted Stock Awards (RSAs)
Shares
Granted		1,213,000	3,156,000
Weighted Average Fair Value at Grant Date
Granted		$ 4.72	$ 6.88
Restricted Stock Units (RSUs)
Shares
Granted	617,000	8,694,000	1,230,000
Weighted Average Fair Value at Grant Date
Granted	$ 5.58	$ 4.15	$ 6.89