Product Line, Customer and Geographic Information - Customers Accounted Revenues by Geographic Location (Detail) - Sales [Member]	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Total Sales	100.00%	100.00%
Europe, Middle East, & Africa [Member] \| Geographic Concentration Risk [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Total Sales	17.00%	14.00%
Asia Pacific [Member] \| Geographic Concentration Risk [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Total Sales	8.00%	10.00%
Other Americas [Member] \| Geographic Concentration Risk [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Total Sales	3.00%	3.00%
Total Foreign Sales [Member] \| Geographic Concentration Risk [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Total Sales	28.00%	27.00%
Total Domestic Sales [Member] \| Geographic Concentration Risk [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Total Sales	72.00%	73.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration