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