Prior Periods Financial Statement Revision - Schedule of Correction of Misstatements and Revision on Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounting Changes And Error Corrections [Line Items]
Cost of sales (exclusive of depreciation and amortization shown separately below)	$ 148,640	$ 114,514	$ 275,084	$ 228,994
Selling, general and administrative expense	26,641	18,004	48,818	34,645
Depreciation and amortization	16,258	13,051	30,539	25,622
Other operating income	(74)	270	(96)	270
Income from operations	(292)	12,642	3,401	26,494
Other (income) expense, net	(1,887)	(285)	(1,574)	437
Loss from continuing operations before benefit for income taxes and share of net income from joint venture	(31,105)	(39,721)	(39,095)	(39,898)
Benefit for income taxes	5,947	12,103	7,123	12,480
Loss from continuing operations	(24,511)	(26,374)	(30,494)	(24,481)
Income from discontinued operations, net of tax (Note 2)	0	5,236	0	10,754
Income from discontinued operations, net of tax (Note 2)	(24,511)	(21,138)	(30,494)	(13,727)
Other comprehensive loss:
Foreign currency translation gain	(15,781)	9,511	(10,316)	14,616
Other comprehensive income	(15,781)	9,511	(10,316)	14,616
Comprehensive income (loss)	$ (40,292)	$ (11,627)	$ (40,810)	$ 889
Basic net loss per share	$ (0.89)	$ (0.77)	$ (1.10)	$ (0.50)
Diluted net loss per share	$ (0.89)	$ (0.77)	$ (1.10)	$ (0.50)
As Previously Reported [Member]
Accounting Changes And Error Corrections [Line Items]
Cost of sales (exclusive of depreciation and amortization shown separately below)				$ 332,994
Selling, general and administrative expense		$ 23,036		44,530
Depreciation and amortization		15,900		31,468
Other operating income		0		0
Income from operations		20,593		42,751
Other (income) expense, net		645		(79)
Loss from continuing operations before benefit for income taxes and share of net income from joint venture		(32,201)		(24,187)
Benefit for income taxes		9,428		7,128
Loss from continuing operations		(21,529)		(14,122)
Income from discontinued operations, net of tax (Note 2)		(21,529)		(14,122)
Other comprehensive loss:
Foreign currency translation gain		9,240		14,244
Other comprehensive income		9,240		14,244
Comprehensive income (loss)		$ (12,289)		$ 122
Basic net loss per share		$ (0.78)		$ (0.52)
Diluted net loss per share		$ (0.78)		$ (0.52)
Adjustment [Member]
Accounting Changes And Error Corrections [Line Items]
Cost of sales (exclusive of depreciation and amortization shown separately below)				$ 485
Selling, general and administrative expense		$ (264)		(764)
Depreciation and amortization		253		265
Other operating income		(270)		(270)
Income from operations		281		284
Other (income) expense, net		(340)		(340)
Loss from continuing operations before benefit for income taxes and share of net income from joint venture		621		624
Benefit for income taxes		(230)		(229)
Loss from continuing operations		391		395
Income from discontinued operations, net of tax (Note 2)		391		395
Other comprehensive loss:
Foreign currency translation gain		271		372
Other comprehensive income		271		372
Comprehensive income (loss)		$ 662		$ 767
Basic net loss per share		$ 0.01		$ 0.01
Diluted net loss per share		$ 0.01		$ 0.01
Discontinued Operations [Member]
Accounting Changes And Error Corrections [Line Items]
Cost of sales (exclusive of depreciation and amortization shown separately below)				$ (104,485)
Selling, general and administrative expense		$ (4,768)		(9,121)
Depreciation and amortization		(3,102)		(6,111)
Other operating income		0		0
Income from operations		(8,232)		(16,541)
Other (income) expense, net		(20)		(18)
Loss from continuing operations before benefit for income taxes and share of net income from joint venture		(8,141)		(16,335)
Benefit for income taxes		2,905		5,581
Loss from continuing operations		(5,236)		(10,754)
Income from discontinued operations, net of tax (Note 2)		5,236		10,754
Continuing Operations As Revised [Member]
Accounting Changes And Error Corrections [Line Items]
Cost of sales (exclusive of depreciation and amortization shown separately below)				228,994
Selling, general and administrative expense		18,004		34,645
Depreciation and amortization		13,051		25,622
Other operating income		(270)		(270)
Income from operations		12,642		26,494
Other (income) expense, net		285		(437)
Loss from continuing operations before benefit for income taxes and share of net income from joint venture		(39,721)		(39,898)
Benefit for income taxes		12,103		12,480
Loss from continuing operations		(26,374)		(24,481)
Income from discontinued operations, net of tax (Note 2)		5,236		10,754
Income from discontinued operations, net of tax (Note 2)		(21,138)		(13,727)
Other comprehensive loss:
Foreign currency translation gain		9,511		14,616
Other comprehensive income		9,511		14,616
Comprehensive income (loss)		$ (11,627)		$ 889
Basic net loss per share		$ (0.77)		$ (0.50)
Diluted net loss per share		$ (0.77)		$ (0.50)