Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Detail)

v2.4.0.8
Segment Information - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Margin              
Total Contribution Margin $ 601,900 $ 485,000 $ 1,728,100 $ 1,428,600      
Selling, general and administrative expenses 409,747 324,200 1,174,574 926,903      
Interest expense, net 4,726 3,546 15,658 8,088      
Income before income taxes 187,414 157,297 537,760 493,566      
Income taxes 45,464 45,424 133,775 141,811 186,944 144,820 87,212
Net income 141,950 111,873 403,985 351,755 463,962 414,959 292,883
Reportable Geographical Components [Member] | United States [Member]
              
Operating Margin              
Total Contribution Margin 90,700 91,000 284,900 280,000      
Reportable Geographical Components [Member] | Mexico [Member]
              
Operating Margin              
Total Contribution Margin 65,100 54,900 187,700 147,800      
Reportable Geographical Components [Member] | South Korea [Member]
              
Operating Margin              
Total Contribution Margin 57,800 53,900 169,400 150,900      
Reportable Geographical Components [Member] | Others [Member]
              
Operating Margin              
Total Contribution Margin 265,700 215,500 797,200 659,600      
Reportable Geographical Components [Member] | Primary Reporting Segment [Member]
              
Operating Margin              
Total Contribution Margin 479,300 415,300 1,439,200 1,238,300      
Reportable Geographical Components [Member] | China [Member]
              
Operating Margin              
Total Contribution Margin $ 122,600 $ 69,700 $ 288,900 $ 190,300