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Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2018 USD ($) plan $ / shares shares | Sep. 30, 2018 USD ($) $ / shares | [1] | Jun. 30, 2018 USD ($) $ / shares | [1] | Mar. 31, 2018 USD ($) $ / shares | [1] | Dec. 31, 2017 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | [2] | Jun. 30, 2017 USD ($) $ / shares | Mar. 31, 2017 USD ($) $ / shares | [2] | Dec. 31, 2018 USD ($) plan $ / shares shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) $ / shares | Jan. 01, 2018 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Net, Current |  | $ 511,332 |  |  |  |  |  |  |  | $ 454,637 |  |  |  |  |  |  |  | $ 511,332 |  | $ 454,637 |  |  |  |
Inventory, Net |  | $ 634,806 |  |  |  |  |  |  |  | 721,290 |  |  |  |  |  |  |  | $ 634,806 |  | 721,290 |  |  |  |
Stock split ratio (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  | 2 |  |
Adoption of accounting standards update related to reclassification of certain tax effects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (22,085) |  |  |  |
Number of stock-based compensation plans | plan |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 412,100 |  | 356,990 |  | $ 299,730 |  |
Net income |  | $ 38,191 | [1] | $ 84,739 |  | $ 55,343 |  | $ 45,721 |  | $ 146,119 | [2] | $ 72,382 |  | $ 27,926 | [2] | $ 23,232 |  | $ 223,994 |  | $ 269,659 |  | $ 153,351 |  |
Earnings Per Share, Diluted | $ / shares |  | $ 0.34 | [1],[3] | $ 0.76 | [3] | $ 0.50 | [3] | $ 0.41 | [3] | $ 1.31 | [2],[3] | $ 0.65 | [3] | $ 0.25 | [2],[3] | $ 0.21 | [3] | $ 2.01 | [4] | $ 2.42 | [4] | $ 1.27 | [4] |
Other assets, net |  | $ 239,900 |  |  |  |  |  |  |  | $ 275,113 |  |  |  |  |  |  |  | $ 239,900 |  | $ 275,113 |  |  |  |
Accrued liabilities |  | 127,342 |  |  |  |  |  |  |  | 123,602 |  |  |  |  |  |  |  | 127,342 |  | 123,602 |  |  |  |
Other liabilities |  | (216,525) |  |  |  |  |  |  |  | (220,211) |  |  |  |  |  |  |  | (216,525) |  | (220,211) |  |  |  |
Reclassification from other comprehensive loss to retained earnings resulting from Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,100 |  |  |  |
Deferred Income Tax Liabilities, Net |  | 268,036 |  |  |  |  |  |  |  | 262,394 |  |  |  |  |  |  |  | 268,036 |  | 262,394 |  |  |  |
Retained Earnings (Accumulated Deficit) |  | 1,997,785 |  |  |  |  |  |  |  | $ 1,809,845 |  |  |  |  |  |  |  | 1,997,785 |  | 1,809,845 |  |  |  |
Cost of Goods Sold | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,759,112 |  | 3,455,306 |  | $ 3,101,065 |  |
Selling, general and administrative expenses (a) | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 308,376 |  | 305,173 |  | 219,926 |  |
Pension and Other Postretirement Benefits Cost (Reversal of Cost) | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (36,966) |  | (33,441) |  | (26,868) |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected additional long-term assets and related lease liabilities |  | 160,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 160,000 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected additional long-term assets and related lease liabilities |  | $ 180,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 180,000 |  |  |  |  |  |
Building |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35 years |  |  |  |  |  |
Machinery and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Machinery and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life (in years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |
Customer Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |
Other Intangible Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 years |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issuable per restricted stock unit (in shares) | shares |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Receivable, Net, Current |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 69,400
Inventory, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (56,600)
Accrued liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900
Deferred Income Tax Liabilities, Net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,100
Accounting Standards Update 2017-07 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods Sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,600 |  | 21,700 |  |
Selling, general and administrative expenses (a) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,800 |  | 5,200 |  |
Pension and Other Postretirement Benefits Cost (Reversal of Cost) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (33,400) |  | $ (26,900) |  |
[1] | The first, second, third and fourth quarters of 2018 include rationalization charges of $0.7 million, $0.5 million, $0.3 million and $4.8 million, respectively. The second quarter of 2018 includes a loss on early extinguishment of debt of $2.5 million.
[2] | The first, second, third and fourth quarters of 2017 include rationalization charges of $0.9 million, $3.0 million, $0.6 million and $1.3 million, respectively. The first, second, third and fourth quarters of 2017 includes costs attributed to announced acquisitions of $13.2 million, $9.8 million, $0.8 million and $0.9 million, respectively. The first and second quarters of 2017 include a loss on early extinguishment of debt of $2.7 million and $4.4 million, respectively. The fourth quarter of 2017 includes the benefit from effective tax rate adjustments totaling $110.9 million primarily related to the remeasurement of net deferred tax liabilities to reflect the lower future cash tax obligations as a result of the reduction in the federal corporate tax rate under the 2017 Tax Act.
[3] | Net income per share data is computed independently for each of the periods presented. Accordingly, the sum of the quarterly earnings per share amounts may not equal the total for the year.
[4] | Per share amounts for 2016 have been retroactively adjusted for the two-for-one stock split discussed in Note 1.
[5] | Cost of goods sold, selling, general and administrative expenses and other pension and postretirement income include the impact of the Accounting Standards Update issued by the Financial Accounting Standards Board which amended the presentation of net periodic pension and postretirement benefit costs to report certain components, including interest cost, expected return on the plan assets, amortization of prior service cost or credits and actuarial gains and losses, separately. For 2017 and 2016, these items have been reclassified from cost of goods sold and selling, general and administrative expenses to other pension and postretirement income.

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