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Segment Information - Additional Information (Detail)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Customer Concentration Risk [Member]
Segment Reporting Information [Line Items]
Description of customer revenue accounted for more than 10% of consolidated revenue		No single customer accounted for more than 10% of the Company's consolidated revenues during the three and nine months ended September 30, 2018 and 2017.
Geographic Concentration Risk [Member]
Segment Reporting Information [Line Items]
Description of customer revenue accounted for more than 10% of consolidated revenue		No other country outside the United States and Canada accounted for more than 10% of the Company's consolidated revenues during the three months ended September 30, 2018. During the three months ended September 30, 2017, no other country outside the United States accounted for more than 10% of the Company's consolidated revenues. No other country outside the United States accounted for more than 10% of the Company's consolidated revenues during the nine months ended September 30, 2018 and 2017.
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Percentage of revenues attributable to customers in Canada	11.80%

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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- Definition

Disclosure of the extent of enterprise reliance on its major customers. For example, includes revenues from transactions with a single external customer amounting to 10 percent or more of the entity's revenues, the total amount of revenues from each such customer, and the identity of the segment or segments reporting the revenues. A group of entities that the entity knows to be under common control generally will be considered a single customer for inclusion in this item. The federal government, a state government, a local government (for example, a county or municipality), or a foreign government each will generally be considered as a single customer for inclusion in this item.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
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