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Segment Reporting - Reconciliation of Segment Information to Consolidated Financial Statements (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  | $ 28,491 |  | $ 27,966 | $ 41,065 | $ 29,738 | $ 35,451 | [1] | $ 27,145 | [1] | $ 45,386 | [1] | $ 41,283 | [1] | $ 127,260 | [2] | $ 149,265 | [1],[2] | $ 154,840 | [2]
Business restructuring | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,744) |  | (2,588) |  | (3,069) |
Interest expense, net |  | (911) |  | (1,402) | (1,766) | (1,853) | (2,151) |  | (2,797) |  | (2,672) |  | (3,151) |  | (5,932) |  | (10,771) |  | (11,444) |
Other, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,571 |  | (725) |  | 3,486 |
Consolidated income before income taxes |  | 27,886 |  | $ 27,449 | $ 39,534 | $ 31,030 | 30,585 | [1] | $ 24,694 | [1] | $ 43,198 | [1] | $ 39,292 | [1] | 125,899 | [2],[4] | 137,769 | [1],[2],[4] | 146,882 | [2],[4]
Assets |  | 1,579,367 | [5] |  |  |  | 1,514,614 | [5] |  |  |  |  |  |  | 1,579,367 | [5] | 1,514,614 | [5] | 1,502,892 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,572 |  | 86,647 |  | 78,613 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 78,701 |  | 81,115 |  | 79,022 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income | [4] |  |  |  |  |  |  |  |  |  |  |  |  |  | 208,762 |  | 211,552 |  | 221,422 |
Assets |  | 1,331,929 |  |  |  |  | 1,285,200 |  |  |  |  |  |  |  | 1,331,929 |  | 1,285,200 |  | 1,311,932 |
Capital expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 103,354 |  | 84,398 |  | 75,780 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76,056 |  | 78,917 |  | 77,119 |
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unallocated corporate expenses | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  | (78,758) |  | (59,699) |  | (63,513) |
Unallocated corporate assets | [4],[7] | $ 247,438 |  |  |  |  | $ 229,414 |  |  |  |  |  |  |  | 247,438 |  | 229,414 |  | 190,960 |
Unallocated corporate expenditures |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,218 |  | 2,249 |  | 2,833 |
Unallocated corporate depreciation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,645 |  | $ 2,198 |  | $ 1,903 |
[1] | The 2018 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO
[2] | The 2018 and 2017 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.
[3] | See Note 23 regarding business restructuring costs.
[4] | The 2018 and 2017 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO
[5] | The 2018 amounts for the noted line items have been retrospectively changed from the amounts originally reported as a result of the Company’s first quarter 2019 change in method of accounting for U.S. inventory valuation from LIFO to FIFO.
[6] | Unallocated corporate expenses primarily comprise corporate administrative expenses (e.g., corporate finance, legal, human resources, information systems, deferred compensation and environmental remediation) that are not included in segment operating income and not used to evaluate segment performance.
[7] | The changes in unallocated corporate assets between 2019, 2018 and 2017 were primarily attributable to changes in the balance of U.S. cash and cash equivalents, which are not allocated to segments.

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