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Summary of Significant Accounting Policies - Summary of Effect of Adoption of ASU 2014-09 and Related ASUs (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Sales
Sales	$ 128,048	$ 184,673	$ 248,854	$ 354,952
Cost of Sales
Cost of Sales	78,052	100,047	159,125	196,617
Loss before benefit for income taxes	(11,259)	17,869	(26,004)	26,214
(Provision) benefit for income taxes	3,589	(5,468)	7,520	(7,162)
Net Income (Loss)	(7,670)	12,401	(18,484)	19,052
ASSETS
Other receivables	28,163		28,163			$ 26,578
Inventory	120,537		120,537			122,542
Equity
Retained earnings	897,586		897,586			$ 922,178
Product [Member]
Sales
Sales	115,063	155,543	220,316	299,140
Cost of Sales
Cost of Sales	69,629	79,663	138,241	156,327
Service [Member]
Sales
Sales	12,985	29,130	28,538	55,812
Cost of Sales
Cost of Sales	8,423	$ 20,384	20,884	$ 40,290
ASU 2014-09 [member]
ASSETS
Other receivables					$ 26,952
Equity
Retained earnings					922,456
ASU 2014-09 [member] | Balances Without Adoption of ASC 606 [Member]
Cost of Sales
Loss before benefit for income taxes	(11,163)		(26,150)
(Provision) benefit for income taxes	3,558		7,556
Net Income (Loss)	(7,605)		(18,594)
ASSETS
Other receivables	28,164		28,164
Inventory	120,426		120,426
Equity
Retained earnings	897,476		897,476
ASU 2014-09 [member] | Effect of Adoption of ASC 606
Cost of Sales
Loss before benefit for income taxes	(96)		146
(Provision) benefit for income taxes	31		(36)
Net Income (Loss)	(65)		110
ASSETS
Other receivables	(1)		(1)		374
Inventory	111		111
Equity
Retained earnings	110		110		$ 278
ASU 2014-09 [member] | Product [Member] | Balances Without Adoption of ASC 606 [Member]
Sales
Sales	115,437		220,876
Cost of Sales
Cost of Sales	70,003		138,726
ASU 2014-09 [member] | Product [Member] | Effect of Adoption of ASC 606
Sales
Sales	(374)		(560)
Cost of Sales
Cost of Sales	(374)		(485)
ASU 2014-09 [member] | Service [Member] | Balances Without Adoption of ASC 606 [Member]
Sales
Sales	13,430		28,130
Cost of Sales
Cost of Sales	8,772		20,697
ASU 2014-09 [member] | Service [Member] | Effect of Adoption of ASC 606
Sales
Sales	(445)		408
Cost of Sales
Cost of Sales	$ (349)		$ 187

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