Condensed Consolidating Financial Statements - Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 57,227	$ 55,444	$ 70,262	$ 105,304
Other current assets	459,427	438,815
Plant, equipment and timberlands, net	803,997	775,898
Other assets	254,115	251,102
Total assets	1,574,766	1,521,259
Liabilities and Shareholders' Equity
Current liabilities	320,835	323,011
Long-term debt	400,470	363,647
Deferred income taxes	57,830	54,995
Other long-term liabilities	126,845	125,780
Total liabilities	905,980	867,433
Shareholders’ equity	668,786	653,826
Total liabilities and shareholders’ equity	1,574,766	1,521,259
Parent Company [Member]
Assets
Cash and cash equivalents	5,220	5,082	29,155	59,130
Other current assets	221,540	206,002
Plant, equipment and timberlands, net	373,725	360,521
Investments in subsidiaries	808,301	789,565
Other assets	125,388	123,010
Total assets	1,534,174	1,484,180
Liabilities and Shareholders' Equity
Current liabilities	421,731	426,628
Long-term debt	321,839	283,686
Deferred income taxes	11,505	10,221
Other long-term liabilities	110,313	109,819
Total liabilities	865,388	830,354
Shareholders’ equity	668,786	653,826
Total liabilities and shareholders’ equity	1,534,174	1,484,180
Guarantors [Member]
Assets
Cash and cash equivalents	2,653	1,461	5,995	465
Other current assets	266,193	256,289
Plant, equipment and timberlands, net	48,238	31,455
Investments in subsidiaries	559,296	540,029
Total assets	876,380	829,234
Liabilities and Shareholders' Equity
Current liabilities	42,433	26,085
Long-term debt	26,000	14,000
Deferred income taxes	(668)	(729)
Other long-term liabilities	314	313
Total liabilities	68,079	39,669
Shareholders’ equity	808,301	789,565
Total liabilities and shareholders’ equity	876,380	829,234
Non Guarantors [Member]
Assets
Cash and cash equivalents	49,354	48,901	$ 35,112	$ 45,709
Other current assets	253,831	242,187
Plant, equipment and timberlands, net	382,034	383,922
Other assets	128,727	128,092
Total assets	813,946	803,102
Liabilities and Shareholders' Equity
Current liabilities	138,808	135,961
Long-term debt	52,631	65,961
Deferred income taxes	46,993	45,503
Other long-term liabilities	16,218	15,648
Total liabilities	254,650	263,073
Shareholders’ equity	559,296	540,029
Total liabilities and shareholders’ equity	813,946	803,102
Adjustments/ Eliminations [Member]
Assets
Other current assets	(282,137)	(265,663)
Investments in subsidiaries	(1,367,597)	(1,329,594)
Total assets	(1,649,734)	(1,595,257)
Liabilities and Shareholders' Equity
Current liabilities	(282,137)	(265,663)
Total liabilities	(282,137)	(265,663)
Shareholders’ equity	(1,367,597)	(1,329,594)
Total liabilities and shareholders’ equity	$ (1,649,734)	$ (1,595,257)