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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  | $ 30,831 | $ 30,309 | $ 38,961 | $ 46,059 | $ 9,932 | $ 28,738 | $ 42,916 | $ 44,607 | $ 146,160 | $ 126,193 | $ 122,790
Business restructuring and asset impairments |  |  |  |  |  |  |  |  |  | (3,069) | (7,064) |
Interest expense, net |  | (2,826) | (2,763) | (2,863) | (2,992) | (3,350) | (2,824) | (3,417) | (3,614) | (11,444) | (13,205) | (14,533)
Loss from equity in joint ventures |  |  |  |  |  |  |  |  |  |  |  | (6,985)
Other, net |  |  |  |  |  |  |  |  |  | 4,521 | 828 | 1,584
Consolidated income before income taxes |  | 28,532 | $ 29,312 | $ 37,063 | $ 44,330 | 7,009 | $ 27,143 | $ 39,196 | $ 40,468 | 139,237 | 113,816 | 102,856
Assets |  | 1,470,861 |  |  |  | 1,353,890 |  |  |  | 1,470,861 | 1,353,890 | 1,238,392
Capital expenditures |  |  |  |  |  |  |  |  |  | 78,613 | 103,076 | 119,349
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 79,022 | 74,967 | 66,985
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  | 212,743 | 207,282 | 189,419
Assets |  | 1,311,932 |  |  |  | 1,208,697 |  |  |  | 1,311,932 | 1,208,697 | 1,124,918
Capital expenditures |  |  |  |  |  |  |  |  |  | 75,780 | 100,205 | 116,867
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 77,119 | 73,122 | 65,322
Segment Reconciling Items [Member] |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Business restructuring and asset impairments | [1] |  |  |  |  |  |  |  |  | (3,069) | (7,064) |
Unallocated corporate expenses | [2] |  |  |  |  |  |  |  |  | (63,514) | (74,025) | (66,629)
Unallocated corporate assets |  | $ 158,929 |  |  |  | $ 145,193 |  |  |  | 158,929 | 145,193 | 113,474
Unallocated corporate expenditures |  |  |  |  |  |  |  |  |  | 2,833 | 2,871 | 2,482
Unallocated corporate depreciation expenses |  |  |  |  |  |  |  |  |  | $ 1,903 | $ 1,845 | $ 1,663
[1] | See Note 22 regarding business restructuring and asset impairment costs.
[2] | 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.

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