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Network
100600 - Disclosure - Income Taxes - Summary of Gross Unrecognized Tax Benefits (Detail)
(http://www.saiacorp.com/20161231/taxonomy/role/DisclosureIncomeTaxesSummaryOfGrossUnrecognizedTaxBenefitsDetail)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001177702 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
Income Tax Disclosure [Abstract]
 
 
Gross unrecognized tax benefits at beginning of year
1,158,000  
1,165,000  
Gross decreases in tax positions for prior years
  
Gross increases in tax positions for current year
490,000  
237,000  
Settlements
(100,000) 
 
Lapse of statute of limitations
(268,000) 
(244,000) 
Gross unrecognized tax benefits at end of year
1,280,000  
 
1,158,000