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Major Customers and International Sales - Additional Information (Detail) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sales | Customer One
Segment Reporting Information [Line Items]
Concentration risk, percentage	13.00%	15.00%	14.00%
Sales | Customer Two
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.00%	11.00%	11.00%
Sales | Customer Three
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.00%	8.00%	10.00%
Receivables | Customer One
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.00%	15.00%
Receivables | Customer Two
Segment Reporting Information [Line Items]
Concentration risk, percentage	9.00%	11.00%
Receivables | Customer Three
Segment Reporting Information [Line Items]
Concentration risk, percentage	8.00%	8.00%

X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

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- Definition

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