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Summary of Effect of Adoption of ASC 606 on Condensed Consolidated Balance Sheet (unaudited) (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Total assets | $ 593,587 | $ 535,592
Deferred income tax liabilities, net | 15,363 | 16,284
Retained earnings | 262,840 | 238,953
Adjustment Due to Adoption of ASC 606 | Accounting Standards Update 2014-09 |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Total assets |  | 3,000
Deferred income tax liabilities, net |  | 786
Retained earnings | 3,289 | 2,214
As adjusted | Accounting Standards Update 2014-09 |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Total assets |  | 538,592
Deferred income tax liabilities, net |  | 17,070
Retained earnings | $ 259,551 | $ 241,167

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