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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  | $ 39,385 | $ 27,694 | $ 44,685 | $ 39,655 | $ 31,398 | $ 30,434 | $ 39,133 | $ 46,230 | $ 151,419 | [1] | $ 147,195 | [1] | $ 127,830 | [1]
Business restructuring and asset impairments |  |  |  |  |  |  |  |  |  | (2,588) |  | (3,069) |  | (7,064) |
Interest expense, net |  | (2,151) | (2,797) | (2,672) | (3,151) | (2,826) | (2,763) | (2,863) | (2,992) | (10,771) |  | (11,444) |  | (13,205) |
Other, net | [1] |  |  |  |  |  |  |  |  | (725) |  | 3,486 |  | (809) |
Consolidated income before income taxes |  | 34,519 | $ 25,243 | $ 42,497 | $ 37,664 | 28,532 | $ 29,312 | $ 37,063 | $ 44,330 | 139,923 |  | 139,237 |  | 113,816 |
Assets |  | 1,484,666 |  |  |  | 1,470,861 |  |  |  | 1,484,666 |  | 1,470,861 |  | 1,353,890 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 86,647 |  | 78,613 |  | 103,076 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 81,115 |  | 79,022 |  | 74,967 |
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income | [1] |  |  |  |  |  |  |  |  | 213,706 |  | 213,777 |  | 208,919 |
Assets |  | 1,285,200 |  |  |  | 1,311,932 |  |  |  | 1,285,200 |  | 1,311,932 |  | 1,208,697 |
Capital expenditures |  |  |  |  |  |  |  |  |  | 84,398 |  | 75,780 |  | 100,205 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 78,917 |  | 77,119 |  | 73,122 |
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business restructuring and asset impairments | [2] |  |  |  |  |  |  |  |  | (2,588) |  | (3,069) |  | (7,064) |
Unallocated corporate expenses | [3] |  |  |  |  |  |  |  |  | (59,699) |  | (63,513) |  | (74,025) |
Unallocated corporate assets | [4] | $ 199,466 |  |  |  | $ 158,929 |  |  |  | 199,466 |  | 158,929 |  | 145,193 |
Unallocated corporate expenditures |  |  |  |  |  |  |  |  |  | 2,249 |  | 2,833 |  | 2,871 |
Unallocated corporate depreciation expenses |  |  |  |  |  |  |  |  |  | $ 2,198 |  | $ 1,903 |  | $ 1,845 |
[1] | The 2017 and 2016 amounts for the noted line items have been immaterially changed from the amounts originally reported as a result of the Company’s first quarter 2018 adoption of ASU No. 2017-7, Compensation –Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.
[2] | See Note 22 regarding business restructuring and asset impairment costs.
[3] | 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.
[4] | The changes in unallocated corporate assets between 2018, 2017 and 2016 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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