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Prior Periods Financial Statement Revision - Schedule of Correction of Misstatements and Revision on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Accounting Changes And Error Corrections [Line Items] |  |  |  |
Income tax receivable | $ 43,253 | $ 1,741 |  |
Other current assets | 18,518 | 7,029 |  |
Total current assets | 477,280 | 282,328 |  |
Property, plant and equipment, net | 259,280 | 230,093 |  |
Goodwill | 454,612 | 443,529 | $ 448,399 |
Investment in joint venture | 39,822 | 36,008 |  |
Other non-current assets | 6,307 | 8,113 |  |
Total assets | 1,475,003 | 1,358,274 | 1,388,337 |
Accounts payable | 52,990 | 44,690 |  |
Accrued salaries, wages and benefits | 21,145 | 17,226 |  |
Other current liabilities | 17,003 | 20,325 |  |
Total current liabilities | 108,421 | 140,241 |  |
Deferred tax liabilities | 71,564 | 96,018 |  |
Other non-current liabilities | 12,516 | 14,300 |  |
Total liabilities | 988,899 | 1,048,883 |  |
Retained earnings | 211,080 | 55,175 | 56,096 |
Accumulated other comprehensive loss | (17,745) | (30,596) | (21,883) |
Total stockholders' equity | 486,104 | 309,391 | 312,431 | $ 172,989
Total liabilities and stockholders' equity | $ 1,475,003 | 1,358,274 |  |
As Previously Reported [Member] |  |  |  |
Accounting Changes And Error Corrections [Line Items] |  |  |  |
Other current assets |  | 11,752 |  |
Total current assets |  | 280,555 |  |
Property, plant and equipment, net |  | 322,953 |  |
Goodwill |  | 450,311 |  |
Investment in joint venture |  | 40,694 |  |
Other non-current assets |  | 9,892 |  |
Total assets |  | 1,360,386 |  |
Accounts payable |  | 75,719 |  |
Accrued salaries, wages and benefits |  | 24,996 |  |
Income tax payable |  | 2,125 |  |
Other current liabilities |  | 23,025 |  |
Total current liabilities |  | 138,616 |  |
Deferred tax liabilities |  | 99,591 |  |
Other non-current liabilities |  | 21,267 |  |
Total liabilities |  | 1,045,187 |  |
Retained earnings |  | 55,509 | 55,151 |
Accumulated other comprehensive loss |  | (25,122) | (19,153) |
Total stockholders' equity |  | 315,199 | 313,881 |
Total liabilities and stockholders' equity |  | 1,360,386 |  |
Adjustment [Member] |  |  |  |
Accounting Changes And Error Corrections [Line Items] |  |  |  |
Income tax receivable |  | 1,041 |  |
Other current assets |  | 32 |  |
Total current assets |  | 1,073 |  |
Property, plant and equipment, net |  | (487) |  |
Goodwill |  | 2,127 |  |
Investment in joint venture |  | (4,686) |  |
Other non-current assets |  | (839) |  |
Total assets |  | (2,812) |  |
Accounts payable |  | (15) |  |
Accrued salaries, wages and benefits |  | 1,464 |  |
Other current liabilities |  | (524) |  |
Total current liabilities |  | 925 |  |
Deferred tax liabilities |  | 600 |  |
Other non-current liabilities |  | 1,471 |  |
Total liabilities |  | 2,996 |  |
Retained earnings |  | (334) | 945 |
Accumulated other comprehensive loss |  | (5,474) | (2,730) |
Total stockholders' equity |  | (5,808) | $ (1,450) |
Total liabilities and stockholders' equity |  | (2,812) |  |
Discontinued Operations [Member] |  |  |  |
Accounting Changes And Error Corrections [Line Items] |  |  |  |
Income tax receivable |  | 700 |  |
Other current assets |  | (4,755) |  |
Total current assets |  | 700 |  |
Property, plant and equipment, net |  | (92,373) |  |
Goodwill |  | (8,909) |  |
Other non-current assets |  | (940) |  |
Total assets |  | 700 |  |
Accounts payable |  | (31,014) |  |
Accrued salaries, wages and benefits |  | (9,234) |  |
Income tax payable |  | (2,125) |  |
Other current liabilities |  | (2,176) |  |
Total current liabilities |  | 700 |  |
Deferred tax liabilities |  | (4,173) |  |
Other non-current liabilities |  | (8,438) |  |
Total liabilities |  | 700 |  |
Total liabilities and stockholders' equity |  | 700 |  |
Continuing Operations As Revised [Member] |  |  |  |
Accounting Changes And Error Corrections [Line Items] |  |  |  |
Income tax receivable |  | 1,741 |  |
Other current assets |  | 7,029 |  |
Total current assets |  | 282,328 |  |
Property, plant and equipment, net |  | 230,093 |  |
Goodwill |  | 443,529 |  |
Investment in joint venture |  | 36,008 |  |
Other non-current assets |  | 8,113 |  |
Total assets |  | 1,358,274 |  |
Accounts payable |  | 44,690 |  |
Accrued salaries, wages and benefits |  | 17,226 |  |
Other current liabilities |  | 20,325 |  |
Total current liabilities |  | 140,241 |  |
Deferred tax liabilities |  | 96,018 |  |
Other non-current liabilities |  | 14,300 |  |
Total liabilities |  | 1,048,883 |  |
Retained earnings |  | 55,175 |  |
Accumulated other comprehensive loss |  | (30,596) |  |
Total stockholders' equity |  | 309,391 |  |
Total liabilities and stockholders' equity |  | $ 1,358,274 |  |

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