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Recent Accounting Standards - Line Items Adjusted in Consolidated Statement of Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Net income | $ 12,699 | $ 18,184 | $ 19,200 | $ 43,694
Foreign currency translation adjustment | (607) | 1,120 | (3,059) | 4,425
Comprehensive income | $ 12,092 | 19,304 | $ 16,141 | 48,089
As Reported | ASU 2014-09 |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Net income |  | 17,924 |  | 43,867
Foreign currency translation adjustment |  | 1,060 |  | 4,090
Comprehensive income |  | 18,984 |  | 47,927
Effect of the Adoption | ASU 2014-09 |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Net income |  | 260 |  | (173)
Foreign currency translation adjustment |  | 60 |  | 335
Comprehensive income |  | $ 320 |  | $ 162

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