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Operating Segment and Enterprise Wide Reporting - Schedule of Revenues by Geographic Destination, Based on Location Products and Services and as a Percentage of Total Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues by geographical area percentage									100.00%	100.00%	100.00%
Revenue	$ 98,583	$ 84,890	$ 96,353	$ 77,749	$ 90,377	$ 80,369	$ 89,733	$ 77,194	$ 357,575	$ 337,673	$ 326,095
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues by geographical area percentage									77.00%	77.00%	77.00%
Revenue									$ 274,151	$ 260,077	$ 252,222
Europe (Excluding United Kingdom) [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues by geographical area percentage									8.00%	9.00%	8.00%
Revenue									$ 29,741	$ 28,525	$ 27,061
United Kingdom [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues by geographical area percentage									4.00%	4.00%	5.00%
Revenue									$ 15,273	$ 13,651	$ 14,808
Canada [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues by geographical area percentage									4.00%	4.00%	4.00%
Revenue									$ 15,569	$ 14,523	$ 13,806
Asia Pacific [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues by geographical area percentage									5.00%	4.00%	4.00%
Revenue									$ 17,839	$ 15,952	$ 13,686
Other [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues by geographical area percentage									2.00%	2.00%	2.00%
Revenue									$ 5,002	$ 4,945	$ 4,512

X

- Definition

Revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts generated in the geographical area as a percentage of total global revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

No definition available.

+ Details

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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