Company's Stock Option RSU and SAR Grants to Equity Incentive Plans (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Equity Incentive Plan [Line Items]
Outstanding at January 1, 2013, Number of Options/SARs RSUs	9,622
Options granted, Number of Options/SARs RSUs	434
Options / SARs / RSUs cancelled/forfeited/expired, Number of Options/SARs / RSUs	(497)
Options / SARs / RSUs exercised, Number of Options/SARs / RSUs	(408)
Outstanding at March 31, 2013, Number of Options/SARs / RSUs	9,501	[1]
Exercisable at March 31, 2013, Number of Options/SARs / RSUs	7,022	[2]
Outstanding at January 1, 2013, Weighted Average Exercise Price	$ 10.72
Options granted, Weighted Average Exercise Price	$ 6.07
Options / SARs / RSUs cancelled/forfeited/expired, Weighted Average Exercise Price	$ 12.45
Options / SARs / RSUs exercised, Weighted Average Exercise Price	$ 6.22
Outstanding at March 31, 2013, Weighted Average Exercise Price	$ 10.21	[1]
Exercisable at March 31, 2013, Weighted Average Exercise Price	$ 11.83	[2]
Outstanding at March 31, 2013, Weighted Average Remaining Contractual Term (years)	3 years 5 months 9 days	[1],[3]
Exercisable at March 31, 2013, Weighted Average Remaining Contractual Term (years)	2 years 8 months 1 day	[2],[3]
Outstanding at March 31, 2013, Aggregate Value	$ 10,876	[1],[4]
Exercisable at March 31, 2013, Aggregate Value	$ 4,855	[2],[4]
Restricted Stock Units (RSUs)
Equity Incentive Plan [Line Items]
SARs/RSUs units granted, Number of Options	350
SARs/RSUs units granted, Weighted Average Exercise Price

[1] Due to the ceiling imposed on the SAR grants, the outstanding amount above can be exercised for a maximum of 6,763 shares of the Company's common stock as of March 31, 2013. SAR grants made prior to January 1, 2009 are convertible for a maximum number of shares of the Company's common stock equal to 50% of the SARs subject to the grant. SAR grants made on or after January 1, 2009 and before January 1, 2010 are convertible for a maximum number of shares of the Company's common stock equal to 75% of the SARs subject to the grant. SAR grants made on or after January 1, 2010 and before January 1, 2012 are convertible for a maximum number of shares of the Company's common stock equal to 66.67% of the SARs subject to the grant. SAR grants made on or after January 1, 2012 are convertible for a maximum number of shares of the Company's common stock equal to 50% of the SARs subject to the grant.

[2] Due to the ceiling imposed on the SAR grants, the exercisable amount above can be exercised for a maximum of 4,856 shares of the Company's common stock as of March 31, 2013.

[3] Calculation of weighted average remaining contractual term does not include the RSUs that were granted, which have indefinite contractual term.

[4] Calculation of aggregate intrinsic value is based on the share price of the Company's common stock on March 31, 2013 ($8.07 per share).