Stock and Incentive Programs for Employees - Additional Information (Detail) (USD $)	12 Months Ended			20 Months Ended		1 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2013 CompensationPlan	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Stock Repurchase Program	May 02, 2011 Two Thousand And Eight Share Repurchase Program	Nov. 17, 2011 Accelerated Share Repurchase Program	May 10, 2011 Accelerated Share Repurchase Program	Dec. 31, 2011 Accelerated Share Repurchase Program	Dec. 31, 2013 Stock Compensation Plan	Dec. 31, 2013 Restricted Stock	Dec. 31, 2012 Restricted Stock	Dec. 31, 2011 Restricted Stock	Dec. 31, 2013 Restricted Stock Director	Dec. 31, 2012 Restricted Stock Director	Dec. 31, 2011 Restricted Stock Director	Dec. 31, 2013 Restricted Stock Between January 2008 And January 2009	Dec. 31, 2013 Restricted Stock Maximum	Dec. 31, 2013 Restricted Stock Minimum	Dec. 31, 2013 Stock options	Dec. 31, 2012 Stock options	Dec. 31, 2011 Stock options	Dec. 31, 2013 Stock options Maximum	Dec. 31, 2013 Stock options Maximum Prior To November Twenty Zero Four And After December Twenty Zero Six	Dec. 31, 2013 Stock options Maximum After Retirement Date	Dec. 31, 2013 Stock options Minimum	Dec. 31, 2013 Performance Share Unit Awards	Dec. 31, 2012 Performance Share Unit Awards	Dec. 31, 2011 Performance Share Unit Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 19,900,000	$ 25,400,000	$ 28,300,000
Share-based compensation expense, income tax benefit	7,700,000	9,900,000	11,000,000
Unrecognized share-based compensation cost	19,700,000									14,300,000									1,700,000							3,700,000
Unrecognized compensation expense, weighted-average period of recognition	2 years 1 month 6 days									2 years 2 months 12 days									1 year 10 months 24 days							1 year 9 months 18 days
Number of active Share-based compensation plan	1
Number of terminated or expired share-based compensation plans	1
Common stock reserved and authorized (in shares)									10,000,000
Shares authorized and available for grant under the 2012 PIP									8,000,000
Award term (in years)																	10 years					10 years	10 years	5 years
Award vesting term																3 years	4 years	3 years				4 years	4 years		3 years	3 years
Amount payable as a percentage of initial award, contingent upon maximum performance																										100.00%
Stock options granted																			0	1,221,000	200,000
Weighted average fair market value of options granted																				$ 2.96	$ 4.39
Intrinsic value of options exercised																			700,000	1,200,000	1,000,000
Cash received from option exercises																			2,200,000	1,400,000	1,000,000
Tax benefit realized for tax deduction from option exercises																			300,000	500,000	400,000
Excess tax benefits shown as financing cash inflows										2,100,000	3,200,000	5,700,000							200,000	400,000	300,000
Share-based compensation (income) expense										15,900,000	21,000,000	24,400,000	2,200,000	(200,000)	100,000				1,500,000	3,200,000	2,700,000					2,500,000	1,200,000	1,200,000
Equity instruments other than options expected to vest, Shares										2,400,000
Equity instruments other than options expected to vest, weighted-average grant date fair value										$ 12.03
Granted, Shares																										485,000	233,000	235,000
Equity instruments other than options, payout range , minimum																										242,500	116,500	117,500
Equity instruments other than options, payout range, maximum																										485,000	233,000	235,000
Equity instruments other than options vested in period																												129,463
Equity instruments other than options, percentage of expected payout																												55.00%
Equity instruments other than options, outstanding shares													124,599	147,263	147,263
Stock repurchase program, authorized amount				1,000,000,000
Stock repurchase program, shares authorized					10,000,000
Treasury stock, shares acquired	0	0				9,300,000	19,900,000	29,200,000
Cash payment for share repurchase under ASR program								$ 500,000,000