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Summary of Significant Accounting Policies - Summary of Impact of Adoption of ASU 2014-09 and Related ASUs (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Sales
Products	$ 105,253	$ 143,597
Services	15,553	26,682
Cost of Sales
Products	68,612	76,664
Services	12,461	19,906
Loss before benefit for income taxes	(14,745)	8,345
(Provision) benefit for income taxes	3,931	(1,694)
Net Income (Loss)	(10,814)	$ 6,651
ASSETS
Other receivables	35,124			$ 26,578
Inventory	120,021			122,542
Equity
Retained earnings	909,611			$ 922,178
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]
Sales
Products	105,439
Services	14,700
Cost of Sales
Products	68,723
Services	11,925
Loss before benefit for income taxes	(14,987)
(Provision) benefit for income taxes	3,998
Net Income (Loss)	(10,989)
ASSETS
Other receivables	35,060
Inventory	119,910
Equity
Retained earnings	909,436
ASU 2014-09 [member] | Effect of Change Higher/(Lower) [Member]
Sales
Products	(186)
Services	853
Cost of Sales
Products	(111)
Services	536
Loss before benefit for income taxes	242
(Provision) benefit for income taxes	(67)
Net Income (Loss)	175
ASSETS
Other receivables	64		374
Inventory	111
Equity
Retained earnings	$ 175		$ 278

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