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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 2 Months Ended 6 Months Ended 4 Months Ended
Mar. 31, 2013
Jun. 30, 2013
Plaintiff
Dec. 31, 2012
Sep. 04, 2012
Jun. 30, 2013
Minimum
Jun. 30, 2013
Maximum
Jan. 04, 2011
Circuit Court Of Cook County
Plaintiff
Jun. 30, 2013
Court of Common Pleas, Philadelphia County
Jan. 04, 2011
Court of Common Pleas, Philadelphia County
Plaintiff
Apr. 22, 2011
Settlement Agreement
Plaintiff
Jun. 30, 2013
Settlement Agreement
Apr. 29, 2011
Settlement Agreement
Jun. 30, 2013
Prior Year
Dec. 31, 2012
Prior Year
Jun. 30, 2013
1999-2004
Circuit Court Of Cook County
Plaintiff
Case
Jun. 30, 2013
2009
Circuit Court Of Cook County
Case
Jun. 30, 2013
2008
Circuit Court Of Cook County
Plaintiff
Jun. 30, 2013
2007-2009
Court of Common Pleas, Philadelphia County
Plaintiff
Case
Jun. 30, 2013
Outside Chicago Firefighter Plaintiffs
1999-2004
Circuit Court Of Cook County
Plaintiff
Jun. 30, 2013
Pennsylvania Firefighter Plaintiffs
2009
Circuit Court Of Cook County
Plaintiff
Dec. 31, 2012
Chicago Firefighter Plaintiffs
Plaintiff
Nov. 30, 2011
Chicago Firefighter Plaintiffs
Plaintiff
Jun. 30, 2013
Chicago Firefighter Plaintiffs
Minimum
Plaintiff
Jun. 30, 2013
Chicago Firefighter Plaintiffs
Maximum
Plaintiff
Jun. 30, 2013
Chicago Firefighter Plaintiffs
2009
Plaintiff
Jun. 30, 2013
Chicago Firefighter Plaintiffs
2009
Circuit Court Of Cook County
Plaintiff
May 31, 2013
Philadelphia Firefighter Plaintiffs
Court of Common Pleas, Philadelphia County
Plaintiff
Case
Jun. 30, 2013
Philadelphia Firefighter Plaintiffs
2010
Court of Common Pleas, Philadelphia County
Plaintiff
Jul. 31, 2013
Pittsburgh Firefighter Plaintiffs
Allegheny County, Pennsylvania
Subsequent Event
Plaintiff
Commitments Disclosure [Line Items]                                                          
Amount outstanding standby letters of credit   $ 28.9 $ 29.2                                                    
Warranty maturity periods         1 year 10 years                                              
Reserves related to environmental remediation   1.7 1.8                                                    
Number of additional cases filed by firefighters                             33 6   71             40   15    
Number of plaintiffs                   1,069         2,443     71 1,800 299 3 8 9 40     15 9 246
Number of cases of plaintiff's claims                                 27 3                      
Plaintiff's counsel later moved to reduce the number of plaintiff                                                   9      
Claims settled amount                     3.8                             0.4      
Number of plaintiffs cases dismissed   2                                                      
Damages maximum amount               0.1                                          
Damages subsequently reduced, minimum amount               0.08                                          
Number of claimants settled             308   1,125                                        
Percentage of claimants agreed for settlement                   95.02%   93.00%                                  
Percentage of claimants agreed for settlement as per settlement agreement                       100.00%                                  
Settlement Agreement payment made                   3.6                                      
Reimbursement   0.1                     0.2 0.7                              
Reimbursement received $ 0.1   $ 0.6                                                    
Holding period purchase proceed held as security       48 months