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Revenue Recognition - Summary of Adoption of ASU 2014-09 on Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Total assets | $ 562,014 | $ 535,592
Deferred income tax liabilities, net | 17,224 | 16,284
Retained earnings | 250,068 | 238,953
Accounting Standards Update 2014-09 |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Retained earnings | 250,068 |
Adjustment Due to Adoption of Topic 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 | 2,214 | 2,214
Balances without adoption of Topic 606 | 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 | $ 247,854 | $ 241,167

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