Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Number of Stock Awards
Beginning Balance (in shares)	4,967,000	[1]
Granted at market value (in shares)	0
Exercised (in shares)	0
Forfeited or expired (in shares)	(276,000)
Ending Balance (in shares)	4,691,000	[1]
Exercisable (in shares)	1,809,000
Available for future grants (in shares)	16,291,000	[2]
Weighted- Average Exercise Price
Beginning Balance (in dollars per share)	$ 18.45
Granted at market value (in dollars per share)	$ 0.00
Exercised (in dollars per share)	$ 0.00
Forfeited or expired (in dollars per share)	$ 36.16
Ending Balance (in dollars per share)	$ 17.41
Exercisable (in dollars per share)	$ 20.95
Aggregate Intrinsic Value of Awards, Outstanding	$ 3,438
Aggregate Intrinsic Value of Awards, Exercisable	$ 1,146
Weighted-Average Remaining Life, Outstanding	3 years 4 months 27 days
Weighted-Average Remaining Life, Exercisable	3 years 2 months 23 days
Stock Appreciation Rights (SARs) [Member]
Number of Stock Awards
Granted at market value (in shares)	1,700,000

[1] Includes 1.7 million of SARs.

[2] Represents options, SARs and awards available for grant