Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	$ 133,743	$ 99,577	$ 173,635
Investing activities
Expenditures for plant, equipment and timberlands	(99,889)	(66,046)	(103,047)
Proceeds from disposal plant, equipment and timberlands, net	24,459	5,072	1,947
Acquisitions, net of cash acquired	(224)	(8,015)	(210,911)
Other	(1,600)	(600)	(425)
Net cash used by investing activities	(77,254)	(69,589)	(312,436)
Financing activities
Net (repayments of) proceeds from indebtedness	(24,650)	(18,128)	182,230
Payments of note offering costs	(1,329)		(419)
Payment of dividends to shareholders	(20,443)	(18,696)	(16,965)
Repurchases of common stock		(12,180)
Payments related to share-based compensation awards and other	(1,594)	(1,877)	(1,671)
Payments related to share-based compensation awards and other			(1,671)
Net cash (used) provided by financing activities	(48,016)	(50,881)	163,175
Effect of exchange rate on cash	(3,006)	(2,152)	829
Net increase (decrease) in cash	5,467	(23,045)	25,203
Cash and cash equivalents at the beginning of period	99,837	122,882	97,679
Cash and cash equivalents at the end of period	105,304	99,837	122,882
Adjustments/ Eliminations [Member]
Investing activities
Repayments from intercompany loans	(57,855)	(20,840)	(18,223)
Advances of intercompany loans	49,230	39,011	27,216
Intercompany capital (contributed) returned	(9,800)
Intercompany capital contributed, net			91
Net cash used by investing activities	(18,425)	18,171	9,084
Financing activities
Repayments of intercompany loans	57,855	20,840	18,223
Borrowings of intercompany loans	(49,230)	(39,011)	(27,216)
Intercompany capital (returned) received	9,800
Intercompany capital received			(91)
Net cash (used) provided by financing activities	18,425	(18,171)	(9,084)
Parent Company [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	34,391	36,240	55,507
Investing activities
Expenditures for plant, equipment and timberlands	(65,265)	(34,518)	(39,496)
Proceeds from disposal plant, equipment and timberlands, net	22,741	3,707	1,435
Advances of intercompany loans		(12,671)
Intercompany capital (contributed) returned	10,100
Other	(1,600)	(600)	(425)
Net cash used by investing activities	(34,024)	(44,082)	(38,486)
Financing activities
Payments of note offering costs	(1,329)		(160)
Payment of dividends to shareholders	(20,443)	(18,696)	(16,965)
Repurchases of common stock		(12,180)
Repayments of intercompany loans	(9,158)		(1,100)
Borrowings of intercompany loans	49,230	26,340	15,310
Payments related to share-based compensation awards and other	(1,745)	(1,630)
Payments related to share-based compensation awards and other			(1,671)
Net cash (used) provided by financing activities	16,555	(6,166)	(4,586)
Net increase (decrease) in cash	16,922	(14,008)	12,435
Cash and cash equivalents at the beginning of period	42,208	56,216	43,781
Cash and cash equivalents at the end of period	59,130	42,208	56,216
Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	627	4,159	4,977
Investing activities
Expenditures for plant, equipment and timberlands	(109)
Proceeds from disposal plant, equipment and timberlands, net	1,213	1,355	333
Repayments from intercompany loans	57,855	20,840	18,223
Advances of intercompany loans	(49,230)	(26,340)	(27,216)
Intercompany capital (contributed) returned	(300)
Intercompany capital contributed, net			(91)
Net cash used by investing activities	9,429	(4,145)	(8,751)
Financing activities
Intercompany capital (returned) received	(10,100)
Net cash (used) provided by financing activities	(10,100)
Net increase (decrease) in cash	(44)	14	(3,774)
Cash and cash equivalents at the beginning of period	509	495	4,269
Cash and cash equivalents at the end of period	465	509	495
Non Guarantors [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided (used) by Operating activities	98,725	59,178	113,151
Investing activities
Expenditures for plant, equipment and timberlands	(34,515)	(31,528)	(63,551)
Proceeds from disposal plant, equipment and timberlands, net	505	10	179
Acquisitions, net of cash acquired	(224)	(8,015)	(210,911)
Net cash used by investing activities	(34,234)	(39,533)	(274,283)
Financing activities
Net (repayments of) proceeds from indebtedness	(24,650)	(18,128)	182,230
Payments of note offering costs			(259)
Repayments of intercompany loans	(48,697)	(20,840)	(17,123)
Borrowings of intercompany loans		12,671	11,906
Intercompany capital (returned) received	300
Intercompany capital received			91
Payments related to share-based compensation awards and other	151	(247)
Net cash (used) provided by financing activities	(72,896)	(26,544)	176,845
Effect of exchange rate on cash	(3,006)	(2,152)	829
Net increase (decrease) in cash	(11,411)	(9,051)	16,542
Cash and cash equivalents at the beginning of period	57,120	66,171	49,629
Cash and cash equivalents at the end of period	$ 45,709	$ 57,120	$ 66,171