Reconciliation Between Effective Income Tax Rate and Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Effective Income Tax Rate [Line Items]
Federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal benefit	2.00%	2.00%	2.00%
Operations taxed at less than U.S. rate	(9.00%)	(2.00%)	(9.00%)
Legal settlement, non-deductible portion		2.00%
Other, net		(1.00%)	1.00%
Effective Income Tax Rate, Continuing Operations, Total	28.00%	36.00%	29.00%