Schedule of Share-based Compensation, Stock Options, Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Shares [Abstract]
Outstanding at January 1	7,584	11,859	15,504
Exercised	(205)	(96)	(58)
Forfeited or expired	(3,502)	(4,179)	(3,587)
Outstanding at December 31	3,877	7,584	11,859
Exercisable at December 31	3,877	7,584	11,859
Weighted-Average Grant Price [Abstract]
Outstanding at January 1	$ 53.88	$ 52.01	$ 49.29
Exercised	$ 10.32	$ 9.25	$ 8.76
Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price	$ 66.25	$ 49.61	$ 40.54
Outstanding at December 31	$ 45.00	$ 53.88	$ 52.01
Exercisable at December 31	$ 45.00	$ 53.88	$ 52.01