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Legal Proceedings - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended 4 Months Ended 12 Months Ended
Sep. 04, 2012
Dec. 31, 2013
Plaintiff
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Circuit Court Of Cook County
Plaintiff
Jan. 04, 2011
Circuit Court Of Cook County
Plaintiff
Dec. 31, 2013
Court of Common Pleas, Philadelphia County
Jan. 04, 2011
Court of Common Pleas, Philadelphia County
Plaintiff
Dec. 31, 2013
Settlement Agreement
Apr. 22, 2011
Settlement Agreement
Plaintiff
Apr. 29, 2011
Settlement Agreement
Dec. 31, 2013
1999-2004
Circuit Court Of Cook County
Plaintiff
Case
Dec. 31, 2013
2009
Circuit Court Of Cook County
Case
Dec. 31, 2013
2008
Circuit Court Of Cook County
Plaintiff
Dec. 31, 2013
2007-2009
Court of Common Pleas, Philadelphia County
Plaintiff
Case
Dec. 31, 2013
Outside Chicago Firefighter Plaintiffs
1999-2004
Circuit Court Of Cook County
Plaintiff
Dec. 31, 2013
Pennsylvania Firefighter Plaintiffs
2009
Circuit Court Of Cook County
Plaintiff
Jun. 08, 2012
Chicago Firefighter Plaintiffs
Plaintiff
Nov. 30, 2011
Chicago Firefighter Plaintiffs
Plaintiff
Dec. 31, 2013
Chicago Firefighter Plaintiffs
2009
Circuit Court Of Cook County
Plaintiff
Jun. 14, 2013
Philadelphia Firefighter Plaintiffs
Court of Common Pleas, Philadelphia County
case
Dec. 31, 2013
Philadelphia Firefighter Plaintiffs
Court of Common Pleas, Philadelphia County
Plaintiff
Case
Dec. 31, 2013
Philadelphia Firefighter Plaintiffs
2010
Court of Common Pleas, Philadelphia County
Plaintiff
Feb. 28, 2014
Pittsburgh Firefighter Plaintiffs [Member]
Court of Common Pleas, Philadelphia County
Plaintiff
Jul. 31, 2013
Pittsburgh Firefighter Plaintiffs [Member]
Court of Common Pleas, Philadelphia County
Plaintiff
Dec. 31, 2013
Maximum
Chicago Firefighter Plaintiffs
Circuit Court Of Cook County
Plaintiff
Dec. 31, 2013
Minimum
Chicago Firefighter Plaintiffs
Circuit Court Of Cook County
Plaintiff
Loss Contingencies [Line Items]                                                      
Number of additional cases filed by firefighters                       33 6   71         40   20          
Number of plaintiffs         74         1,069   2,443     71 1,800 299 3 8     20 9 61 246 40 9
Number of cases dismissed                                         1            
Number of cases of plaintiff's claims                           27 3                        
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   $ 0.5 $ 0.7 $ 0.8                                              
Holding period purchase proceed held as security 48 months