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Unaudited Pro Forma Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Sales | $ 1,597,920 | $ 1,530,922
Operating income | 98,019 | 52,213
Net income | $ 123,030 | $ 17,428
Basic net income per share | $ 1.79 | $ 0.25
Diluted net income per share | $ 1.78 | $ 0.25

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