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Recent Accounting Standards - Line Items Adjusted in Consolidated Statement of Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 3,301 | $ 12,699 | $ 4,828 | $ 1,673 | $ (25,499) | $ 18,184 | $ 9,953 | $ 15,557 | $ 22,501 | $ 18,195 | $ 92,239
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | (4,128) | 5,300 | (3,533)
Comprehensive income |  |  |  |  |  |  |  |  | $ 17,943 | 23,465 | 88,718
As Reported | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 17,643 | 90,908
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | 4,805 | (3,347)
Comprehensive income |  |  |  |  |  |  |  |  |  | 22,418 | 87,573
Effect of the Adoption | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 552 | 1,331
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | 495 | (186)
Comprehensive income |  |  |  |  |  |  |  |  |  | $ 1,047 | $ 1,145

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