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Adoption of ASC 606 - Summary of Impact of Adoption of Accounting Standards (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net sales	$ 94,730	$ 79,781	$ 103,199	$ 100,450	$ 88,917	$ 92,390	$ 122,853	$ 123,344	$ 378,160	$ 427,504	$ 374,585
Cost of sales									362,325	422,038	423,891
Gross profit	$ 12,411	$ (9,742)	$ 3,073	$ 10,093	$ (10,204)	$ (7,285)	$ 11,340	$ 11,615	15,835	5,466	(49,306)
Selling, general and administrative expense									40,811	34,990	40,168
Operating loss									(23,025)	$ (34,091)	$ (90,223)
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net sales									378,160
Cost of sales									362,325
Gross profit									15,835
Selling, general and administrative expense									40,811
Operating loss									(23,025)
Accounting Standards Update 2014-09 [Member] | Balances without adoption of 606 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net sales									443,821
Cost of sales									427,405
Gross profit									16,415
Selling, general and administrative expense									41,391
Operating loss									(23,025)
Accounting Standards Update 2014-09 [Member] | Effect of Change Higher/(Lower) [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net sales									(65,661)
Cost of sales									(65,080)
Gross profit									(580)
Selling, general and administrative expense									$ (580)

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