Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	$ 59,437	$ 70,523
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(116,948)	(74,280)
Proceeds from disposals of plant, equipment and timberlands, net	55	3,181
Acquisition, net of cash acquired		(224)
Other	(400)	(1,600)
Net cash used by investing activities	(117,293)	(72,923)
Financing activities
Net long-term borrowings	14,983	(3,387)
Payments of borrowing costs	(136)	(1,329)
Payment of dividends to shareholders	(16,134)	(15,215)
Proceeds from government grants	5,251
Payments related to share-based compensation awards and other	(990)	(2,015)
Net cash provided (used) by financing activities	2,974	(21,946)
Effect of exchange rate on cash	330	(1,826)
Net decrease in cash and cash equivalents	(54,552)	(26,172)
Cash and cash equivalents at the beginning of period	105,304	99,837
Cash and cash equivalents at the end of period	50,752	73,665
Adjustments/ Eliminations [Member]
Investing activities
Repayments from intercompany loans	(11,101)	(55,320)
Advances of intercompany loans	12,330	44,590
Intercompany capital (contributed) returned	17,500	(10,200)
Net cash used by investing activities	18,729	(20,930)
Financing activities
Repayments of intercompany loans	11,101	55,320
Borrowings of intercompany loans	(12,330)	(44,590)
Intercompany capital (returned) received	(17,500)	10,200
Net cash provided (used) by financing activities	(18,729)	20,930
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	41,753	9,927
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(78,187)	(52,331)
Proceeds from disposals of plant, equipment and timberlands, net	41	1,584
Repayments from intercompany loans		1,465
Intercompany capital (contributed) returned	(17,000)	10,500
Other	(400)	(1,600)
Net cash used by investing activities	(95,546)	(40,382)
Financing activities
Payments of borrowing costs	(136)	(1,329)
Payment of dividends to shareholders	(16,134)	(15,215)
Repayments of intercompany loans		(9,158)
Borrowings of intercompany loans	12,330	44,590
Proceeds from government grants	3,251
Payments related to share-based compensation awards and other	(990)	(2,015)
Net cash provided (used) by financing activities	(1,679)	16,873
Net decrease in cash and cash equivalents	(55,472)	(13,582)
Cash and cash equivalents at the beginning of period	59,130	42,208
Cash and cash equivalents at the end of period	3,658	28,626
Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	3,748	152
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(21,066)	(42)
Proceeds from disposals of plant, equipment and timberlands, net		1,213
Repayments from intercompany loans	11,101	53,855
Advances of intercompany loans	(12,330)	(44,590)
Intercompany capital (contributed) returned	(500)	(300)
Net cash used by investing activities	(22,795)	10,136
Financing activities
Intercompany capital (returned) received	17,000	(10,500)
Proceeds from government grants	2,000
Net cash provided (used) by financing activities	19,000	(10,500)
Net decrease in cash and cash equivalents	(47)	(212)
Cash and cash equivalents at the beginning of period	465	509
Cash and cash equivalents at the end of period	418	297
Non Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	13,936	60,444
Investing activities
Expenditures for purchases of plant, equipment and timberlands	(17,695)	(21,907)
Proceeds from disposals of plant, equipment and timberlands, net	14	384
Acquisition, net of cash acquired		(224)
Net cash used by investing activities	(17,681)	(21,747)
Financing activities
Net long-term borrowings	14,983	(3,387)
Repayments of intercompany loans	(11,101)	(46,162)
Intercompany capital (returned) received	500	300
Net cash provided (used) by financing activities	4,382	(49,249)
Effect of exchange rate on cash	330	(1,826)
Net decrease in cash and cash equivalents	967	(12,378)
Cash and cash equivalents at the beginning of period	45,709	57,120
Cash and cash equivalents at the end of period	$ 46,676	$ 44,742