XML 14 R1.htm IDEA: XBRL DOCUMENT v3.3.1.900
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Feb. 19, 2016
Jun. 30, 2015
Document And Entity Information      
Entity Registrant Name AAON INC    
Entity Central Index Key 0000824142    
Document Type 10-K    
Document Period End Date Dec. 31, 2015    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Is Entity a Well-known Seasoned Issuer? No    
Is Entity a Voluntary Filer? No    
Is Entity's Reporting Status Current? Yes    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   53,049,365  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2015    
Entity Public Float     $ 919.4