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Interim Consolidated Financial Statements - Summary of Effect of Adopting ASC 606 In Consolidated Statement of Income (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenues: |  |  |  |
Total revenues | $ 96,353 | $ 89,733 | $ 174,102 | $ 166,927
Operating expenses: |  |  |  |
Selling and marketing | 32,709 | 30,508 | 65,720 | 61,130
Total operating expenses | 85,326 | 79,520 | 165,363 | 153,578
Income from operations | 11,027 | 10,213 | 8,739 | 13,349
Income before income taxes | 11,278 | 10,284 | 8,847 | 13,226
Income tax provision | 3,490 | 4,220 | 2,792 | 4,132
Net income | $ 7,788 | $ 6,064 | $ 6,055 | $ 9,094
Basic income per common share | $ 0.43 | $ 0.34 | $ 0.34 | $ 0.51
Diluted income per common share | $ 0.43 | $ 0.34 | $ 0.33 | $ 0.50
Research Services [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | $ 58,300 | $ 54,575 | $ 110,000 | $ 106,318
Advisory Services and Events [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 38,053 | 35,158 | 64,102 | 60,609
Cost of Services and Fulfillment [Member] |  |  |  |
Operating expenses: |  |  |  |
Cost of services and fulfillment | 39,071 | $ 36,910 | 73,176 | $ 68,306
ASC 606 [Member] | Amounts as if Previous Guidance in Effect [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 96,469 |  | 176,474 |
Operating expenses: |  |  |  |
Selling and marketing | 32,558 |  | 65,631 |
Total operating expenses | 85,017 |  | 165,101 |
Income from operations | 11,452 |  | 11,373 |
Income before income taxes | 11,703 |  | 11,481 |
Income tax provision | 3,650 |  | 3,637 |
Net income | $ 8,053 |  | $ 7,844 |
Basic income per common share | $ 0.45 |  | $ 0.44 |
Diluted income per common share | $ 0.44 |  | $ 0.43 |
ASC 606 [Member] | Research Services [Member] | Amounts as if Previous Guidance in Effect [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | $ 58,323 |  | $ 111,710 |
ASC 606 [Member] | Advisory Services and Events [Member] | Amounts as if Previous Guidance in Effect [Member] |  |  |  |
Revenues: |  |  |  |
Total revenues | 38,146 |  | 64,764 |
ASC 606 [Member] | Cost of Services and Fulfillment [Member] | Amounts as if Previous Guidance in Effect [Member] |  |  |  |
Operating expenses: |  |  |  |
Cost of services and fulfillment | $ 38,913 |  | $ 73,003 |

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