Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Effects of Prior Period Errors in Consolidated Balance Sheet (Detail)

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Significant Accounting Policies - Effects of Prior Period Errors in Consolidated Balance Sheet (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Prepaid expenses and other current assets $ 160,444 $ 145,624 $ 134,605
Deferred income taxes 51,499 49,339 54,949
Total current assets 1,503,965 984,047 785,685
Total assets 2,254,003 1,724,143 1,463,075
Income taxes payable 48,751 61,325 62,283
Total current liabilities 792,254 762,362 579,557
Deferred income taxes 60,033 62,982 70,390
Total liabilities 1,820,384 1,328,660 914,931
Retained earnings 172,057 123,096 293,887
Total shareholders' equity 433,619 395,483 548,144
Total liabilities and shareholders' equity 2,254,003 1,724,143 1,463,075
As Previously Reported [Member]
      
Prepaid expenses and other current assets   125,425 117,073
Deferred income taxes   49,339 55,615
Total current assets   963,848 768,819
Total assets   1,703,944 1,446,209
Income taxes payable   15,854 31,415
Total current liabilities   716,891 548,689
Deferred income taxes   62,982 72,348
Total liabilities   1,283,189 886,021
Retained earnings   148,368 305,931
Total shareholders' equity   420,755 560,188
Total liabilities and shareholders' equity   $ 1,703,944 $ 1,446,209