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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investments, Owned, Federal Income Tax Note [Line Items]      
Effective income tax rate reconciliation at federal statutory income tax rate 35.00%    
Deferred Tax Assets, Operating Loss Carryforwards, State and Local $ 1,200 $ 1,200  
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 2,300    
Unrecognized Tax Benefits 10,625 10,625 $ 10,648
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 1,800 $ 1,100  
Operating Loss Carry forward Expiration Dates expire beginning in 2017, if unused    
U.S. Federal      
Investments, Owned, Federal Income Tax Note [Line Items]      
Operating Loss Carry forward Expiration Dates 2003 through 2016    
Indiana State      
Investments, Owned, Federal Income Tax Note [Line Items]      
Operating Loss Carry forward Expiration Dates 2014 through 2016