Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	$ 7,659	$ 7,561
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(26,568)	(36,783)
Proceeds from disposals of plant, equipment and timberlands, net	1,695
Other	(28)
Net cash used by investing activities	(24,901)	(36,783)
Financing activities
Net (repayments) borrowings of long-term debt	22,486	36,046
Payment of dividends to shareholders	(5,679)	(5,455)
Payments related to share-based compensation awards and other	(965)	(112)
Net cash provided by financing activities	15,842	30,479
Effect of exchange rate on cash	2,458	526
Net increase in cash and cash equivalents	1,058	1,783
Cash and cash equivalents at the beginning of period	116,219	55,444
Cash and cash equivalents at the end of period	117,277	57,227
Adjustments/ Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities		(641)
Investing activities
Repayments from intercompany loans		(8,000)
Advances of intercompany loans	2,310	8,550
Intercompany capital (contributed) returned		400
Net cash used by investing activities	2,310	950
Financing activities
Borrowings of intercompany loans	(2,310)	(8,550)
Payment of intercompany dividend		641
Net cash provided by financing activities	(2,310)	(309)
Repayments of intercompany loans		8,000
Intercompany capital received		(400)
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	(10,584)	(19,330)
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(8,251)	(21,515)
Proceeds from disposals of plant, equipment and timberlands, net	539
Other	(28)
Net cash used by investing activities	(7,740)	(21,515)
Financing activities
Net (repayments) borrowings of long-term debt	2,388	38,000
Payment of dividends to shareholders	(5,679)	(5,455)
Borrowings of intercompany loans	2,310	8,550
Payment of intercompany dividend	20,000
Payments related to share-based compensation awards and other	(965)	(112)
Net cash provided by financing activities	18,054	40,983
Net increase in cash and cash equivalents	(270)	138
Cash and cash equivalents at the beginning of period	1,292	5,082
Cash and cash equivalents at the end of period	1,022	5,220
Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	(980)	(307)
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(11,320)	(9,551)
Proceeds from disposals of plant, equipment and timberlands, net	1,156
Repayments from intercompany loans		8,000
Advances of intercompany loans	(2,310)	(8,550)
Intercompany capital (contributed) returned	20,000	(400)
Net cash used by investing activities	7,526	(10,501)
Financing activities
Net (repayments) borrowings of long-term debt	14,000	12,000
Payment of intercompany dividend	(20,000)
Net cash provided by financing activities	(6,000)	12,000
Net increase in cash and cash equivalents	546	1,192
Cash and cash equivalents at the beginning of period	720	1,461
Cash and cash equivalents at the end of period	1,266	2,653
Non Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	19,223	27,839
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(6,997)	(5,717)
Intercompany capital (contributed) returned	(20,000)
Net cash used by investing activities	(26,997)	(5,717)
Financing activities
Net (repayments) borrowings of long-term debt	6,098	(13,954)
Payment of intercompany dividend		(641)
Net cash provided by financing activities	6,098	(22,195)
Repayments of intercompany loans		(8,000)
Intercompany capital received		400
Effect of exchange rate on cash	2,458	526
Net increase in cash and cash equivalents	782	453
Cash and cash equivalents at the beginning of period	114,207	48,901
Cash and cash equivalents at the end of period	$ 114,989	$ 49,354