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Discontinued Operations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 12 Months Ended
Jun. 21, 2012
May 31, 2012
Sep. 30, 2012
Mar. 31, 2011
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Federal Signal Technologies
Dec. 31, 2010
Federal Signal Technologies
Dec. 31, 2012
Federal Signal Technologies
Dec. 31, 2011
Federal Signal Technologies
Dec. 31, 2010
Federal Signal Technologies
Sep. 01, 2010
Riverchase
Dec. 31, 2010
Riverchase
Dec. 31, 2011
Trade Names
Federal Signal Technologies
Dec. 31, 2010
Trade Names
Federal Signal Technologies
Jun. 21, 2012
Working Capital Adjustment
Jun. 21, 2012
Cash
Jun. 21, 2012
Escrow
Dec. 31, 2012
Neology
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                          
Proceeds from sale agreement $ 110.0                                 $ 5.9 $ 82.1 $ 22.0  
Assets held for sale carrying value 121.1                                        
Fair value less cost to sell 97.6                                        
Asset held for sale fair value 101.0                                        
Cost to sell assets held for sale 3.4                                        
Impairment charges         23.5 0.6                              
Escrow receivable 5.0         8.0                              
Increase in carrying value of asset held for sale 0.8                                        
Transaction cost 0.5                                        
Total loss on disposal     12.2     34.7                              
Escrow identified for general representations and warranties period           18 months                              
Remaining general escrow fund to be held           36 months                              
Escrow associated with lawsuits                                         48 months
Sale proceeds to repay obligations           75.0                              
Goodwill impairment charges                 14.8 67.1                      
Impairment charges of intangible assets                               7.4 11.8        
Goodwill adjustment       1.6                                  
Gain on discontinued operations related to the liquidation of the assets of the China WOFE business           0.4                              
Loss from discontinued operations, costs associated with wind down of business             0.5                            
Loss from discontinued operations, write-down of assets and other costs               2.1                          
Proceed from sale of discontinued operations                           0.2              
Loss from discontinued operations                     (14.8) (27.9) (86.4) 2.1 (1.3)            
Loss from discontinued operations, write-off of intangible assets                             1.9            
Proceed from sale of Pearland   0.9                                      
Pre tax gain   0.4                                      
Environmental remediation at the Pearland, Texas facility           1.8 2.2                            
Estimated product liability obligations           $ 4.6 $ 5.1