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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
	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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