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Recent Accounting Standards - Line Items Adjusted in Consolidated Statement of Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Net income | $ 1,673 | $ 15,557
Foreign currency translation adjustment | 1,440 | 1,048
Comprehensive income | $ 3,113 | 16,575
As Reported |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Net income |  | 14,867
Foreign currency translation adjustment |  | 812
Comprehensive income |  | 15,649
Effect of the Adoption | ASU 2014-09 |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Net income |  | 690
Foreign currency translation adjustment |  | 236
Comprehensive income |  | $ 926

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