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Operating Segment and Enterprise Wide Reporting - Schedule of Revenues by Geographic Destination and as a Percentage of Total Revenues (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 83,446 | $ 77,427 | $ 87,821 | $ 77,401 | $ 80,975 | $ 74,753 | $ 82,811 | $ 75,187 | $ 326,095 | $ 313,726 | $ 312,062
Revenues by geographical area percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 252,222 | $ 241,025 | $ 232,440
Revenues by geographical area percentage |  |  |  |  |  |  |  |  | 77.00% | 77.00% | 74.00%
Europe (Excluding United Kingdom) [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 27,061 | $ 24,607 | $ 30,257
Revenues by geographical area percentage |  |  |  |  |  |  |  |  | 8.00% | 8.00% | 10.00%
United Kingdom [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 14,808 | $ 16,815 | $ 16,804
Revenues by geographical area percentage |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00%
Canada [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 13,806 | $ 14,424 | $ 17,089
Revenues by geographical area percentage |  |  |  |  |  |  |  |  | 4.00% | 5.00% | 6.00%
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 18,198 | $ 16,855 | $ 15,472
Revenues by geographical area percentage |  |  |  |  |  |  |  |  | 6.00% | 5.00% | 5.00%

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- 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 Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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