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Legal Proceedings - Additional Information (Detail) |  |  | 1 Months Ended | 2 Months Ended | 4 Months Ended | 5 Months Ended | 12 Months Ended | 36 Months Ended |  |
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Apr. 24, 2015 Case | Jun. 14, 2013 case | Jan. 31, 2016 Plaintiff Case | Nov. 30, 2015 Plaintiff | Feb. 28, 2015 Case | Jan. 31, 2015 Case | Feb. 28, 2014 Plaintiff | Jun. 08, 2012 Plaintiff | Nov. 30, 2011 Plaintiff | Dec. 31, 2015 USD ($) Plaintiff case Case | Jul. 31, 2013 Plaintiff | Dec. 31, 2015 USD ($) Plaintiff case Case | Dec. 31, 2015 USD ($) Plaintiff case Case | Dec. 31, 2015 USD ($) Plaintiff case Case | Dec. 31, 2015 USD ($) Plaintiff case Case | Dec. 31, 2015 USD ($) plaintiff Plaintiff case Case | Dec. 31, 2015 USD ($) Plaintiff case Case | Dec. 31, 2015 USD ($) Plaintiff case Case | Dec. 31, 2014 USD ($) Plaintiff | Dec. 31, 2013 USD ($) | Apr. 22, 2011 USD ($) Plaintiff | Dec. 31, 2010 | Dec. 31, 2010 plaintiff | Dec. 31, 2010 Plaintiff | Dec. 31, 2009 Plaintiff Case | Apr. 29, 2011 | Jan. 04, 2011 Plaintiff
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed | Case |  |  |  |  |  |  |  |  |  | 23 |  | 23 | 23 | 23 | 23 | 23 | 23 | 23 |  |  |  |  |  |  |  |  |
Number of plaintiffs | Case |  |  |  |  |  |  |  |  |  | 210 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs cases dismissed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Reimbursement | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 |  |  |  | $ 300,000 | $ 500,000 |  |  |  |  |  |  |
Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 74 |  |  |  |  |  |  |  |
Number of claimants settled |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 308
Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages maximum amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Damages subsequently reduced, minimum amount | $ |  |  |  |  |  |  |  |  |  | $ 80,000 |  | $ 80,000 | $ 80,000 | $ 80,000 | 80,000 | $ 80,000 | $ 80,000 | $ 80,000 |  |  |  |  |  |  |  |  |
Number of claimants settled |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,125
Settlement Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,069 |  |  |  |  |  |
Claims settled amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |
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 | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,600,000 |  |  |  |  |  |
Supreme Court of Kings County, New York [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases dismissed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
1999-2004 | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed | Case |  |  |  |  |  |  |  |  |  | 33 |  | 33 | 33 | 33 | 33 | 33 | 33 | 33 |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,443 |  |  |  |  |  |  |  |  |  |
2009 | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed | Case |  |  |  |  |  |  |  |  |  | 6 |  | 6 | 6 | 6 | 6 | 6 | 6 | 6 |  |  |  |  |  |  |  |  |
2008 | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Claims Settled and Dismissed, Number |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 |  |  |  |  |  |  |  |  |  |
2007-2009 | Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trials occurred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Number of additional cases filed | Case |  |  |  |  |  |  |  |  |  | 71 |  | 71 | 71 | 71 | 71 | 71 | 71 | 71 |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 71 |  |  |  |  |  |  |  |  |  |
Loss Contingency, Claims Dismissed, Number | Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Loss Contingency, Claims Settled and Dismissed, Number | Case |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |
Outside Chicago Firefighter Plaintiffs | 1999-2004 | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,800 |  |  |  |  |  |  |  |  |  |
Pennsylvania Firefighter Plaintiffs | 2009 | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 299 |  |  |  |  |  |  |  |  |  |
Chicago Firefighter Plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  | 3 | 8 |  |  |  |  |  |  |  | 1,800 |  |  |  |  |  |  |  |  |  |
Chicago Firefighter Plaintiffs | 2009 | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed |  |  |  |  |  |  |  |  |  | 40 |  | 40 | 40 | 40 | 40 | 40 | 40 | 40 |  |  |  |  |  |  |  |  |
Claims settled amount | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |
Philadelphia Firefighter Plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed | Case |  |  |  |  |  | 2 |  |  |  | 7 |  | 7 | 7 | 7 | 7 | 7 | 7 | 7 |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |
Philadelphia Firefighter Plaintiffs | Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed | Case |  |  |  |  |  |  |  |  |  | 20 |  | 20 | 20 | 20 | 20 | 20 | 20 | 20 |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 | 70 |  |  |  |  |  |  |  |  |
Number of cases dismissed | case |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Philadelphia Firefighter Plaintiffs | 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 | 9 |  |  |
Philadelphia Firefighter Plaintiffs | 2010 | Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Trial or Alternative Dispute Resolution |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
District of Columbia Firefighter Plaintiffs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | Case |  |  |  |  |  | 11 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outside Pennsylvania Firefighter Plaintiffs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed | Case |  |  |  |  |  |  |  |  |  | 9 |  | 9 | 9 | 9 | 9 | 9 | 9 | 9 |  |  |  |  |  |  |  |  |
Number of plaintiffs | Case |  |  |  |  |  |  |  |  |  |  |  | 193 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pittsburgh Firefighter Plaintiffs | Court of Common Pleas, Philadelphia County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  | 61 |  |  |  | 247 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cases dismissed |  |  |  |  |  |  |  |  |  |  | 41 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Erie County Firefighter Plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32 |  |  |  |  |  |  |  |  |  |  |
Buffalo Fire Department Firefighters [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed | case |  |  |  |  |  |  |  |  |  | 20 |  | 20 | 20 | 20 | 20 | 20 | 20 | 20 |  |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 193 |  |  |  |  |  |  |  |  |  |  |
New York City Firefighter Plaintiffs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs | Case | 8 |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Jersey Firefighter Plaintiffs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  | 34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Chicago Firefighter Plaintiffs | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40 |  |  |  |  |  |  |  |  |  |
Minimum | Chicago Firefighter Plaintiffs | Circuit Court Of Cook County |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | New Jersey Firefighter Plaintiffs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of additional cases filed | Case |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of plaintiffs |  |  | 41 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Latvian Commercial Dispute [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages subsequently reduced, minimum amount | $ |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |
Damages subsequently reduced, maximum amount | $ |  |  |  |  |  |  |  |  |  | $ 2,500,000 |  | $ 2,500,000 | $ 2,500,000 | $ 2,500,000 | $ 2,500,000 | $ 2,500,000 | $ 2,500,000 | $ 2,500,000 |  |  |  |  |  |  |  |  |
Litigation Settlement, Percent of Legal Fees |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation Settlement, Percentage of Legal Fees Excluded |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |

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