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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided (used) by Operating activities | $ 104,262 | $ 116,110 | $ 133,743
Investing activities |  |  |
Expenditures for purchases of plant, equipment and timberlands | (132,304) | (160,158) | (99,889)
Proceeds from disposals of plant, equipment and timberlands, net | 228 | 70 | 24,459
Acquisition, net of cash acquired |  |  | (224)
Other | (243) | (800) | (1,600)
Net cash used by investing activities | (132,319) | (160,888) | (77,254)
Financing activities |  |  |
Net long-term borrowings | 99,665 | 14,114 | (24,650)
Payments of borrowing costs |  | (136) | (1,329)
Payments of dividends | (22,480) | (21,589) | (20,443)
Proceeds from government grants | 4,875 | 5,582 | 421
Payments related to share-based compensation awards and other | (472) | (990) | (2,015)
Net cash provided (used) by financing activities | 81,588 | (3,019) | (48,016)
Effect of exchange rate on cash | 7,244 | (2,063) | (3,006)
Net increase (decrease) in cash and cash equivalents | 60,775 | (49,860) | 5,467
Cash and cash equivalents at the beginning of period | 55,444 | 105,304 | 99,837
Cash and cash equivalents at the end of period | 116,219 | 55,444 | 105,304
Adjustments/ Eliminations [Member] |  |  |
Investing activities |  |  |
Repayments from intercompany loans | (12,000) | (15,601) | (57,855)
Advances of intercompany loans | 14,400 | 18,330 | 49,230
Intercompany capital (contributed) returned | 14,400 | 17,500 | (9,800)
Net cash used by investing activities | 16,800 | 20,229 | (18,425)
Financing activities |  |  |
Repayments of intercompany loans | 12,000 | 15,601 | 57,855
Borrowings of intercompany loans | (14,400) | (18,330) | (49,230)
Intercompany capital (returned) received | (14,400) | (17,500) | 9,800
Net cash provided (used) by financing activities | (16,800) | (20,229) | 18,425
Parent Company [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided (used) by Operating activities | (4,259) | 33,109 | 34,391
Investing activities |  |  |
Expenditures for purchases of plant, equipment and timberlands | (65,822) | (104,595) | (65,265)
Proceeds from disposals of plant, equipment and timberlands, net | 11 | 41 | 22,741
Intercompany capital (contributed) returned | (14,000) | (17,000) | 10,100
Other | (243) | (800) | (1,600)
Net cash used by investing activities | (80,054) | (122,354) | (34,024)
Financing activities |  |  |
Net long-term borrowings | 84,200 | 36,000 |
Payments of borrowing costs |  | (136) | (1,329)
Payments of dividends | (22,480) | (21,589) | (20,443)
Repayments of intercompany loans |  |  | (9,158)
Borrowings of intercompany loans | 14,400 | 18,330 | 49,230
Proceeds from government grants | 4,875 | 3,582 | 421
Payments related to share-based compensation awards and other | (472) | (990) | (2,166)
Net cash provided (used) by financing activities | 80,523 | 35,197 | 16,555
Net increase (decrease) in cash and cash equivalents | (3,790) | (54,048) | 16,922
Cash and cash equivalents at the beginning of period | 5,082 | 59,130 | 42,208
Cash and cash equivalents at the end of period | 1,292 | 5,082 | 59,130
Guarantors [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided (used) by Operating activities | (3,506) | 1,275 | 627
Investing activities |  |  |
Expenditures for purchases of plant, equipment and timberlands | (45,644) | (30,682) | (109)
Proceeds from disposals of plant, equipment and timberlands, net | 209 |  | 1,213
Repayments from intercompany loans | 12,000 | 15,601 | 57,855
Advances of intercompany loans | (14,400) | (18,330) | (49,230)
Intercompany capital (contributed) returned | (400) | (500) | (300)
Net cash used by investing activities | (48,235) | (33,911) | 9,429
Financing activities |  |  |
Net long-term borrowings | 37,000 | 14,000 |
Intercompany capital (returned) received | 14,000 | 17,000 | (10,100)
Payment of intercompany dividend |  | 632 |
Proceeds from government grants |  | 2,000 |
Net cash provided (used) by financing activities | 51,000 | 33,632 | (10,100)
Net increase (decrease) in cash and cash equivalents | (741) | 996 | (44)
Cash and cash equivalents at the beginning of period | 1,461 | 465 | 509
Cash and cash equivalents at the end of period | 720 | 1,461 | 465
Non Guarantors [Member] |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |
Net cash provided (used) by Operating activities | 112,027 | 81,726 | 98,725
Investing activities |  |  |
Expenditures for purchases of plant, equipment and timberlands | (20,838) | (24,881) | (34,515)
Proceeds from disposals of plant, equipment and timberlands, net | 8 | 29 | 505
Acquisition, net of cash acquired |  |  | (224)
Net cash used by investing activities | (20,830) | (24,852) | (34,234)
Financing activities |  |  |
Net long-term borrowings | (21,535) | (35,886) | (24,650)
Repayments of intercompany loans | (12,000) | (15,601) | (48,697)
Intercompany capital (returned) received | 400 | 500 | 300
Payment of intercompany dividend |  | (632) |
Payments related to share-based compensation awards and other |  |  | 151
Net cash provided (used) by financing activities | (33,135) | (51,619) | (72,896)
Effect of exchange rate on cash | 7,244 | (2,063) | (3,006)
Net increase (decrease) in cash and cash equivalents | 65,306 | 3,192 | (11,411)
Cash and cash equivalents at the beginning of period | 48,901 | 45,709 | 57,120
Cash and cash equivalents at the end of period | $ 114,207 | $ 48,901 | $ 45,709

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