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Income Taxes (Narrative) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Tax Credit Carryforward [Line Items]      
Operating Loss Carryforwards Expiration Year 2031    
Operating Loss Carryforwards $ 8,000    
Income Tax Expense (Benefit), Intraperiod Tax Allocation, Total 8,983 $ 9,887 $ 4,905
Tax Credit Carryforward, Amount $ 110    
Tax Credit Carryforward Expiration Year 2022    
Deferred Tax Liabilities, Net, Noncurrent $ 779 3,682  
Accounting Standards Update 2015-17 [Member]      
Tax Credit Carryforward [Line Items]      
Deferred Tax Assets Reclassified, Current $ 1,700 $ 1,200 $ 3,700
Maryland State [Member]      
Tax Credit Carryforward [Line Items]      
Operating Loss Carryforwards Expiration Year 2017    
Operating Loss Carryforwards $ 116