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1114 - Disclosure - Income Taxes - Summary of Reconciliation of Income Tax Expense (Benefit) at Federal Statutory Rate to Recorded Income Tax Expense (Benefit) (Detail)
(http://www.alsk.com/taxonomy/role/DisclosureIncomeTaxesSummaryOfReconciliationOfIncomeTaxExpenseBenefitAtFederalStatutoryRateToRecordedIncomeTaxExpenseBenefit)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001089511 (http://www.sec.gov/CIK)
Effective Income Tax Rate Reconciliation, Amount [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Effective Income Tax Rate Reconciliation, Amount [Abstract]
 
 
 
Computed federal income taxes at the statutory rate
1,313,000  
8,080,000  
(1,598,000) 
Expense (benefit) in tax resulting from:
 
 
 
State income taxes (net of Federal benefit)
229,000  
1,408,000  
(278,000) 
Other
(209,000) 
263,000  
58,000  
Stock-based compensation
27,000  
449,000  
31,000  
Change in valuation allowance
139,000  
0  
 
Total income tax expense (benefit)
1,499,000  
 
10,200,000  
 
(1,787,000)