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Interim Consolidated Financial Statements - Summary of Effect of Adopting ASC 606 In Consolidated Statement of Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net income | $ 7,788 | $ 6,064 | $ 6,055 | $ 9,094
Comprehensive income | 4,456 | $ 8,585 | 4,311 | $ 12,422
ASC 606 [Member] | Amounts as if Previous Guidance in Effect [Member] |  |  |  |
Net income | 8,053 |  | 7,844 |
Comprehensive income | $ 4,721 |  | $ 6,100 |

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