XML 81 R66.htm IDEA: XBRL DOCUMENT v3.7.0.1
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
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%