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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 9 Months Ended |  | 9 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 4 Months Ended | 12 Months Ended |  | 3 Months Ended | 72 Months Ended |  | 12 Months Ended | 36 Months Ended | 72 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended |  | 12 Months Ended | 7 Months Ended | 10 Months Ended | 12 Months Ended | 1 Months Ended | 4 Months Ended | 3 Months Ended | 0 Months Ended
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Apr. 22, 2014 | Nov. 30, 2012 Plaintiff | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013 | Sep. 30, 2014 Minimum | Sep. 30, 2014 Maximum | Dec. 31, 2013 Circuit Court Of Cook County plaintiff | Jan. 04, 2011 Circuit Court Of Cook County Plaintiff | Dec. 31, 2010 Court of Common Pleas, Philadelphia County | Jan. 04, 2011 Court of Common Pleas, Philadelphia County Plaintiff | Apr. 22, 2011 Settlement Agreement Plaintiff | Dec. 31, 2013 Settlement Agreement | Apr. 22, 2011 Settlement Agreement | Apr. 29, 2011 Settlement Agreement | Sep. 30, 2014 Supreme Court of Kings County New York [Member] Plaintiff | Dec. 31, 2004 1999-2004 Circuit Court Of Cook County plaintiff case | Dec. 31, 2009 2009 Circuit Court Of Cook County case | Dec. 31, 2008 2008 Circuit Court Of Cook County Plaintiff | Dec. 31, 2009 2007-2009 Court of Common Pleas, Philadelphia County Plaintiff case | Dec. 31, 2009 2007-2009 Court of Common Pleas, Philadelphia County Case | Dec. 31, 2004 Outside Chicago Firefighter Plaintiffs 1999-2004 Circuit Court Of Cook County plaintiff | Dec. 31, 2009 Pennsylvania Firefighter Plaintiffs 2009 Circuit Court Of Cook County plaintiff | Nov. 30, 2012 Chicago Firefighter Plaintiffs Plaintiff | Dec. 31, 2012 Chicago Firefighter Plaintiffs Plaintiff | Nov. 30, 2011 Chicago Firefighter Plaintiffs Plaintiff | Dec. 31, 2009 Chicago Firefighter Plaintiffs Minimum plaintiff | Dec. 31, 2009 Chicago Firefighter Plaintiffs Maximum Plaintiff | Dec. 31, 2009 Chicago Firefighter Plaintiffs 2009 Plaintiff | Dec. 31, 2009 Chicago Firefighter Plaintiffs 2009 Circuit Court Of Cook County Plaintiff | Oct. 31, 2012 Philadelphia Firefighter Plaintiffs Court of Common Pleas, Philadelphia County Plaintiff Case | Mar. 31, 2014 Philadelphia Firefighter Plaintiffs Court of Common Pleas, Philadelphia County case | Jun. 30, 2014 Philadelphia Firefighter Plaintiffs Court of Common Pleas, Philadelphia County case | Dec. 31, 2010 Philadelphia Firefighter Plaintiffs 2010 Court of Common Pleas, Philadelphia County plaintiff | Dec. 31, 2010 Philadelphia Firefighter Plaintiffs 2010 Court of Common Pleas, Philadelphia County Plaintiff | Mar. 31, 2014 Pittsburgh Firefighter Plaintiffs Court of Common Pleas, Philadelphia County Plaintiff | Jul. 31, 2013 Pittsburgh Firefighter Plaintiffs Allegheny County, Pennsylvania Plaintiff | Sep. 30, 2014 Buffalo Firefighter Plaintiffs [Member] [Domain] Supreme Court of State of New York Erie County [Member] [Member] Plaintiff | Nov. 04, 2014 Subsequent Event [Member]
Commitments Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 15.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75.0
Amount outstanding standby letters of credit |  |  | 46.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warranty maturity periods |  |  |  |  |  | 1 year | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reserves related to environmental remediation |  |  | 1.3 |  | 1.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed by firefighters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33 | 6 |  | 71 | 71 |  |  |  |  |  |  |  | 40 |  | 20 |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  | 74 |  |  |  | 1,069 |  |  |  |  | 2,443 |  |  | 71 | 71 | 1,800 | 299 | 3 | 3 | 8 | 9 | 40 |  |  | 20 |  |  | 9 | 9 | 61 | 246 | 193 |
Loss Contingency, Claims Dismissed, Number |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |
Loss Contingency, New Claims Filed, Number |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 |
Loss Contingency, Number of Cases Dismissed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  | 38 |  |
Loss Contingency, Number of Cases Scheduled |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |
Number of cases of plaintiff's claims |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 | 3 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  | 95.02% | 93.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of claimants agreed for settlement as per settlement agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement Agreement payment made |  |  |  |  |  |  |  |  |  |  |  |  |  | (3.6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reimbursement |  |  | 0.2 | 0.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Latvian Commercial Case Range of Loss |  |  |  |  |  | $ 0 | $ 5.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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