Earnings Per Share (Detail) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic weighted average shares outstanding	335,192		350,714		353,346
Dilutive effect of stock options and restricted stock/RSUs	6,139	[1]	2,785	[1]	0	[1]
Diluted weighted average shares outstanding	341,331		353,499		353,346
Stock Options And RSUs [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive outstanding options excluded from computation of earnings per share					2,353
Stock Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive outstanding options excluded from computation of earnings per share	3,683		8,246		23,672

[1] Excludes the following outstanding options to purchase shares of common stock because these options had exercise prices in excess of the average market price of our common stock during the year and therefore the effect of including these options would be antidilutive: 2014 - 3,683; 2013 - 8,246 and 2012 - 23,672. Additionally, because of the net loss in 2012, 2,353 otherwise dilutive stock options and restricted stock/RSUs were not included in the calculation of diluted EPS. The inclusion of these dilutive stock options and restricted stock/RSUs would have improved the diluted loss per share. For this reason, diluted EPS in 2012 was calculated using the same number of weighted average shares as basic EPS.