Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	$ 28,764	$ 36,640
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(71,047)	(80,391)
Proceeds from disposals of plant, equipment and timberlands, net	83	53
Other		(300)
Net cash used by investing activities	(70,964)	(80,638)
Financing activities
Net long-term borrowings	63,708	4,222
Payments of borrowing costs		(136)
Payments of dividends	(11,130)	(10,679)
Proceeds from government grants		4,443
Payments related to share-based compensation awards and other	(112)	(976)
Net cash provided (used) by financing activities	52,466	(3,126)
Effect of exchange rate on cash	3,732	352
Net increase (decrease) in cash and cash equivalents	13,998	(46,772)
Cash and cash equivalents at the beginning of period	55,444	105,304
Cash and cash equivalents at the end of period	69,442	58,532
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	(12,072)	17,067
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(40,739)	(51,043)
Proceeds from disposals of plant, equipment and timberlands, net	8	41
Intercompany capital (contributed) returned		(17,000)
Other		(300)
Net cash used by investing activities	(40,731)	(68,302)
Financing activities
Net long-term borrowings	55,000
Payments of borrowing costs		(51)
Payments of dividends	(11,130)	(10,679)
Borrowings of intercompany loans	12,550	7,880
Proceeds from government grants		2,443
Payments related to share-based compensation awards and other	(112)	(976)
Net cash provided (used) by financing activities	56,308	(1,383)
Net increase (decrease) in cash and cash equivalents	3,505	(52,618)
Cash and cash equivalents at the beginning of period	5,082	59,130
Cash and cash equivalents at the end of period	8,587	6,512
Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	(1,085)	2,821
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(21,421)	(18,861)
Proceeds from disposals of plant, equipment and timberlands, net	75
Repayments from intercompany loans	12,000	7,500
Advances of intercompany loans	(12,550)	(7,880)
Intercompany capital (contributed) returned	(400)	(500)
Net cash used by investing activities	(22,296)	(19,741)
Financing activities
Net long-term borrowings	25,000
Intercompany capital (returned) received		17,000
Proceeds from government grants		2,000
Net cash provided (used) by financing activities	25,000	19,000
Net increase (decrease) in cash and cash equivalents	1,619	2,080
Cash and cash equivalents at the beginning of period	1,461	465
Cash and cash equivalents at the end of period	3,080	2,545
Non Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	42,606	16,752
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(8,887)	(10,487)
Proceeds from disposals of plant, equipment and timberlands, net		12
Net cash used by investing activities	(8,887)	(10,475)
Financing activities
Net long-term borrowings	(16,292)	4,222
Payments of borrowing costs		(85)
Repayments of intercompany loans	(12,000)	(7,500)
Intercompany capital (returned) received	400	500
Payment of intercompany dividend	(685)
Net cash provided (used) by financing activities	(28,577)	(2,863)
Effect of exchange rate on cash	3,732	352
Net increase (decrease) in cash and cash equivalents	8,874	3,766
Cash and cash equivalents at the beginning of period	48,901	45,709
Cash and cash equivalents at the end of period	57,775	49,475
Adjustments/ Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	(685)
Investing activities
Repayments from intercompany loans	(12,000)	(7,500)
Advances of intercompany loans	12,550	7,880
Intercompany capital (contributed) returned	400	17,500
Net cash used by investing activities	950	17,880
Financing activities
Repayments of intercompany loans	12,000	7,500
Borrowings of intercompany loans	(12,550)	(7,880)
Intercompany capital (returned) received	(400)	(17,500)
Payment of intercompany dividend	685
Net cash provided (used) by financing activities	$ (265)	$ (17,880)