Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 234,070	$ 116,219
Other current assets	318,815	278,800
Current assets held for sale	188,322	189,952
Plant, equipment and timberlands, net	497,568	515,183
Other assets	240,269	222,730
Noncurrent assets held for sale	271,731	407,911
Total assets	1,750,775	1,730,795
Liabilities and Shareholders' Equity
Current liabilities	220,235	234,356
Current liabilities held for sale	110,163	112,820
Long-term debt	635,406	470,098
Deferred income taxes	56,599	83,571
Other long-term liabilities	80,946	79,649
Long-term liabilities held for sale	40,480	41,373
Total liabilities	1,143,829	1,021,867
Shareholders’ equity	606,946	708,928
Total liabilities and shareholders’ equity	1,750,775	1,730,795
Adjustments/ Eliminations [Member]
Assets
Other current assets	(343,585)	(277,989)
Investments in subsidiaries	(1,508,810)	(1,483,023)
Total assets	(1,852,395)	(1,761,012)
Liabilities and Shareholders' Equity
Current liabilities	(343,585)	(277,989)
Total liabilities	(343,585)	(277,989)
Shareholders’ equity	(1,508,810)	(1,483,023)
Total liabilities and shareholders’ equity	(1,852,395)	(1,761,012)
Parent Company [Member]
Assets
Cash and cash equivalents	1,735	1,292
Other current assets	87,635	59,341
Current assets held for sale	188,322	189,952
Plant, equipment and timberlands, net	24,618	24,671
Investments in subsidiaries	848,832	829,895
Other assets	99,394	82,201
Noncurrent assets held for sale	271,731	407,911
Total assets	1,522,267	1,595,263
Liabilities and Shareholders' Equity
Current liabilities	312,663	289,967
Current liabilities held for sale	110,163	112,820
Long-term debt	406,962	368,496
Deferred income taxes	(14,346)	14,081
Other long-term liabilities	59,399	59,598
Long-term liabilities held for sale	40,480	41,373
Total liabilities	915,321	886,335
Shareholders’ equity	606,946	708,928
Total liabilities and shareholders’ equity	1,522,267	1,595,263
Guarantors [Member]
Assets
Cash and cash equivalents	3,682	720
Other current assets	273,697	217,822
Plant, equipment and timberlands, net	86,722	80,992
Investments in subsidiaries	659,978	653,128
Total assets	1,024,079	952,662
Liabilities and Shareholders' Equity
Current liabilities	97,154	54,640
Long-term debt	68,000	51,000
Deferred income taxes	18,293	16,814
Other long-term liabilities	654	313
Total liabilities	184,101	122,767
Shareholders’ equity	839,978	829,895
Total liabilities and shareholders’ equity	1,024,079	952,662
Non Guarantors [Member]
Assets
Cash and cash equivalents	228,653	114,207
Other current assets	301,068	279,626
Plant, equipment and timberlands, net	386,228	409,520
Other assets	140,875	140,529
Total assets	1,056,824	943,882
Liabilities and Shareholders' Equity
Current liabilities	154,003	167,738
Long-term debt	160,444	50,602
Deferred income taxes	52,652	52,676
Other long-term liabilities	20,893	19,738
Total liabilities	387,992	290,754
Shareholders’ equity	668,832	653,128
Total liabilities and shareholders’ equity	$ 1,056,824	$ 943,882