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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Investments, Owned, Federal Income Tax Note [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards, State and Local $ 1,200 $ 1,300  
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 2,500    
Unrecognized Tax Benefits 10,625 10,648 $ 10,971
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued $ 1,100 $ 300  
Operating Loss Carryforward Expiration Dates expire beginning in 2016, if unused    
U.S. Federal      
Investments, Owned, Federal Income Tax Note [Line Items]      
Operating Loss Carryforward Expiration Dates 2003 through 2015    
Indiana State      
Investments, Owned, Federal Income Tax Note [Line Items]      
Operating Loss Carryforward Expiration Dates 2003 through 2015