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 $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Margin              
Total Contribution Margin $ 592,500,000 $ 493,100,000 $ 1,126,000,000 $ 943,500,000      
Selling, general and administrative expenses 400,107,000 306,310,000 764,827,000 602,703,000      
Interest expense, net 5,559,000 3,169,000 10,932,000 4,542,000      
Income before income taxes 186,798,000 183,537,000 350,346,000 336,269,000      
Income taxes 43,636,000 51,586,000 88,311,000 96,387,000 186,944,000 144,820,000 87,212,000
Net income 143,162,000 131,951,000 262,035,000 239,882,000 463,962,000 414,959,000 292,883,000
Reportable Geographical Components [Member] | United States [Member]
              
Operating Margin              
Total Contribution Margin 99,500,000 93,600,000 194,200,000 189,000,000      
Reportable Geographical Components [Member] | Mexico [Member]
              
Operating Margin              
Total Contribution Margin 64,000,000 49,000,000 122,600,000 92,900,000      
Reportable Geographical Components [Member] | South Korea [Member]
              
Operating Margin              
Total Contribution Margin 56,400,000 55,000,000 111,600,000 97,000,000      
Reportable Geographical Components [Member] | Others [Member]
              
Operating Margin              
Total Contribution Margin 266,800,000 226,100,000 531,300,000 444,000,000      
Reportable Geographical Components [Member] | Primary Reporting Segment [Member]
              
Operating Margin              
Total Contribution Margin 486,700,000 423,700,000 959,700,000 822,900,000      
Reportable Geographical Components [Member] | China [Member]
              
Operating Margin              
Total Contribution Margin $ 105,800,000 $ 69,400,000 $ 166,300,000 $ 120,600,000