Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and cash equivalents	$ 107,189	$ 116,219
Other current assets	497,136	468,752
Plant, equipment and timberlands, net	844,467	865,743
Other assets	288,305	280,081
Total assets	1,737,097	1,730,795
Liabilities and Shareholders' Equity
Current liabilities	336,875	347,176
Long-term debt	510,177	470,098
Deferred income taxes	76,064	83,571
Other long-term liabilities	127,029	121,022
Total liabilities	1,050,145	1,021,867
Shareholders’ equity	686,952	708,928
Total liabilities and shareholders’ equity	1,737,097	1,730,795
Adjustments/ Eliminations [Member]
Assets
Other current assets	(316,171)	(277,989)
Investments in subsidiaries	(1,490,005)	(1,483,023)
Total assets	(1,806,176)	(1,761,012)
Liabilities and Shareholders' Equity
Current liabilities	(316,171)	(277,989)
Total liabilities	(316,171)	(277,989)
Shareholders’ equity	(1,490,005)	(1,483,023)
Total liabilities and shareholders’ equity	(1,806,176)	(1,761,012)
Parent Company [Member]
Assets
Cash and cash equivalents	1,201	1,292
Other current assets	262,122	249,293
Plant, equipment and timberlands, net	367,703	375,231
Investments in subsidiaries	837,670	829,895
Other assets	144,794	139,552
Total assets	1,613,490	1,595,263
Liabilities and Shareholders' Equity
Current liabilities	422,603	402,787
Long-term debt	394,462	368,496
Deferred income taxes	3,201	14,081
Other long-term liabilities	106,272	100,971
Total liabilities	926,538	886,335
Shareholders’ equity	686,952	708,928
Total liabilities and shareholders’ equity	1,613,490	1,595,263
Guarantors [Member]
Assets
Cash and cash equivalents	1,729	720
Other current assets	256,018	217,822
Plant, equipment and timberlands, net	86,461	80,992
Investments in subsidiaries	652,335	653,128
Total assets	996,543	952,662
Liabilities and Shareholders' Equity
Current liabilities	81,975	54,640
Long-term debt	67,000	51,000
Deferred income taxes	18,542	16,814
Other long-term liabilities	485	313
Total liabilities	168,002	122,767
Shareholders’ equity	828,541	829,895
Total liabilities and shareholders’ equity	996,543	952,662
Non Guarantors [Member]
Assets
Cash and cash equivalents	104,259	114,207
Other current assets	295,167	279,626
Plant, equipment and timberlands, net	390,303	409,520
Other assets	143,511	140,529
Total assets	933,240	943,882
Liabilities and Shareholders' Equity
Current liabilities	148,468	167,738
Long-term debt	48,715	50,602
Deferred income taxes	54,321	52,676
Other long-term liabilities	20,272	19,738
Total liabilities	271,776	290,754
Shareholders’ equity	661,464	653,128
Total liabilities and shareholders’ equity	$ 933,240	$ 943,882