Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	$ (16,212)	$ 20,501
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(32,155)	(57,978)
Proceeds from disposals of plant, equipment and timberlands, net	2,073	209
Other	(68)	(100)
Total investing activities	(30,150)	(57,869)
Financing activities
Net borrowings of long-term debt	166,388	89,587
Payment of dividends to shareholders	(17,064)	(16,805)
Payments related to share-based compensation awards and other	(1,008)	(128)
Total financing activities	148,316	72,654
Effect of exchange rate on cash	(3,931)	5,448
Net increase in cash and cash equivalents	98,023	40,734
Change in cash from discontinued operations	19,828	(11,891)
Cash and cash equivalents at the beginning of period	116,219	55,444
Cash and cash equivalents at the end of period	234,070	84,287
Adjustments/ Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	(20,000)
Investing activities
Repayments from intercompany loans		(12,000)
Advances of intercompany loans	5,285	13,500
Intercompany capital contributed	315	2,400
Intercompany capital returned	(20,000)
Total investing activities	(14,400)	3,900
Intercompany capital returned	20,000
Financing activities
Repayments of intercompany loans		12,000
Borrowings of intercompany loans	(5,285)	(13,500)
Intercompany capital received	(315)	(2,400)
Intercompany capital returned	20,000
Payment of intercompany dividend	20,000
Total financing activities	34,400	(3,900)
Cash and cash equivalents at the end of period	0	0
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	(40,899)	(49,361)
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(3,655)	(11,221)
Proceeds from disposals of plant, equipment and timberlands, net	17
Intercompany capital contributed		(2,000)
Other	(68)	(100)
Total investing activities	(3,706)	(13,321)
Financing activities
Net borrowings of long-term debt	38,007	73,298
Payment of dividends to shareholders	(17,064)	(16,805)
Borrowings of intercompany loans	5,285	13,500
Payments related to share-based compensation awards and other	(1,008)	(128)
Total financing activities	25,220	69,865
Net increase in cash and cash equivalents	(19,385)	7,183
Change in cash from discontinued operations	19,828	(11,891)
Cash and cash equivalents at the beginning of period	1,292	5,082
Cash and cash equivalents at the end of period	1,735	374
Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	3,350	(3,241)
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(13,834)	(32,847)
Proceeds from disposals of plant, equipment and timberlands, net	2,046	209
Repayments from intercompany loans		12,000
Advances of intercompany loans	(5,285)	(13,500)
Intercompany capital contributed	(315)	(400)
Intercompany capital returned	20,000
Total investing activities	2,612	(34,538)
Intercompany capital returned	(20,000)
Financing activities
Net borrowings of long-term debt	17,000	35,000
Intercompany capital received		2,000
Payment of intercompany dividend	(20,000)
Total financing activities	(3,000)	37,000
Net increase in cash and cash equivalents	2,962	(779)
Cash and cash equivalents at the beginning of period	720	1,461
Cash and cash equivalents at the end of period	3,682	682
Non Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	41,337	73,103
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(14,666)	(13,910)
Proceeds from disposals of plant, equipment and timberlands, net	10
Total investing activities	(14,656)	(13,910)
Financing activities
Net borrowings of long-term debt	111,381	(18,711)
Repayments of intercompany loans		(12,000)
Intercompany capital received	315	400
Intercompany capital returned	(20,000)
Total financing activities	91,696	(30,311)
Effect of exchange rate on cash	(3,931)	5,448
Net increase in cash and cash equivalents	114,446	34,330
Cash and cash equivalents at the beginning of period	114,207	48,901
Cash and cash equivalents at the end of period	$ 228,653	$ 83,231