Accrued Liabilities - Other - Summary of Activity in Accrued Warranty and Service Liabilities (Parenthetical) (Detail) - USD ($)	9 Months Ended
Sep. 30, 2015	Jul. 27, 2015
Product Warranty Liability [Line Items]
Reversal of specific warranty reserves	$ (216,000)
Davall [Member]
Product Warranty Liability [Line Items]
Business acquisition, warranty reserve		$ 165,000

Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard and extended product warranties (including adjustments for changes in estimates).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(4))

-URI http://asc.fasb.org/extlink&oid=51674963&loc=d3e12565-110249

Name:	us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration