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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jan. 01, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Taxes [Line Items]          
INCOME TAX EXPENSE   $ 1,669,000 $ 400,000 $ 7,121,000 $ 634,000
Gain from settlement of litigation against Ancestry.com DNA LLC       12,500,000  
U.S. federal or state deferred income tax expense or benefits   $ 0 $ 0 $ 0 $ 0
Accounting Standards Update Two Thousand Sixteen Zero Nine [Member]          
Income Taxes [Line Items]          
Cumulative-effect adjustment to retained earnings $ 3,391,000        
Net impact of cumulative-effect adjustment to retained earnings 0        
Accounting Standards Update Two Thousand Sixteen Zero Nine [Member] | Valuation Allowance, Operating Loss Carryforwards [Member]          
Income Taxes [Line Items]          
Cumulative-effect adjustment to retained earnings $ 3,391,000