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Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash and cash equivalents | $ 117,277 | $ 116,219 | $ 57,227 | $ 55,444
Other current assets | 491,423 | 468,752 |  |
Plant, equipment and timberlands, net | 870,734 | 865,743 |  |
Other assets | 285,178 | 280,081 |  |
Total assets | 1,764,612 | 1,730,795 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 338,696 | 347,176 |  |
Long-term debt | 494,131 | 470,098 |  |
Deferred income taxes | 85,025 | 83,571 |  |
Other long-term liabilities | 122,768 | 121,022 |  |
Total liabilities | 1,040,620 | 1,021,867 |  |
Shareholders’ equity | 723,992 | 708,928 |  |
Total liabilities and shareholders’ equity | 1,764,612 | 1,730,795 |  |
Adjustments/ Eliminations [Member] |  |  |  |
Assets |  |  |  |
Other current assets | (293,035) | (277,989) |  |
Investments in subsidiaries | (1,509,573) | (1,483,023) |  |
Total assets | (1,802,608) | (1,761,012) |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | (293,035) | (277,989) |  |
Total liabilities | (293,035) | (277,989) |  |
Shareholders’ equity | (1,509,573) | (1,483,023) |  |
Total liabilities and shareholders’ equity | (1,802,608) | (1,761,012) |  |
Parent Company [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 1,022 | 1,292 | 5,220 | 5,082
Other current assets | 250,524 | 249,293 |  |
Plant, equipment and timberlands, net | 370,669 | 375,231 |  |
Investments in subsidiaries | 842,154 | 829,895 |  |
Other assets | 142,088 | 139,552 |  |
Total assets | 1,606,457 | 1,595,263 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 398,152 | 402,787 |  |
Long-term debt | 371,036 | 368,496 |  |
Deferred income taxes | 12,049 | 14,081 |  |
Other long-term liabilities | 101,228 | 100,971 |  |
Total liabilities | 882,465 | 886,335 |  |
Shareholders’ equity | 723,992 | 708,928 |  |
Total liabilities and shareholders’ equity | 1,606,457 | 1,595,263 |  |
Guarantors [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 1,266 | 720 | 2,653 | 1,461
Other current assets | 237,841 | 217,822 |  |
Plant, equipment and timberlands, net | 87,000 | 80,992 |  |
Investments in subsidiaries | 667,419 | 653,128 |  |
Total assets | 993,526 | 952,662 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 67,660 | 54,640 |  |
Long-term debt | 65,000 | 51,000 |  |
Deferred income taxes | 18,209 | 16,814 |  |
Other long-term liabilities | 503 | 313 |  |
Total liabilities | 151,372 | 122,767 |  |
Shareholders’ equity | 842,154 | 829,895 |  |
Total liabilities and shareholders’ equity | 993,526 | 952,662 |  |
Non Guarantors [Member] |  |  |  |
Assets |  |  |  |
Cash and cash equivalents | 114,989 | 114,207 | $ 49,354 | $ 48,901
Other current assets | 296,093 | 279,626 |  |
Plant, equipment and timberlands, net | 413,065 | 409,520 |  |
Other assets | 143,090 | 140,529 |  |
Total assets | 967,237 | 943,882 |  |
Liabilities and Shareholders' Equity |  |  |  |
Current liabilities | 165,919 | 167,738 |  |
Long-term debt | 58,095 | 50,602 |  |
Deferred income taxes | 54,767 | 52,676 |  |
Other long-term liabilities | 21,037 | 19,738 |  |
Total liabilities | 299,818 | 290,754 |  |
Shareholders’ equity | 667,419 | 653,128 |  |
Total liabilities and shareholders’ equity | $ 967,237 | $ 943,882 |  |

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