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Summary of Pension Assets in Three Tier Fair Value Hierarchy for Benefit Plan (Detail) - USD ($)		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Receivables		$ 100,000	$ 300,000
U.S. Benefit Plans
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		128,100,000	134,000,000	$ 129,400,000
U.S. Benefit Plans | Total
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value	[1]	128,200,000	133,700,000
U.S. Benefit Plans | Total | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		6,800,000	2,500,000
U.S. Benefit Plans | Total | US Large Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		37,800,000	40,200,000
U.S. Benefit Plans | Total | US Small / Mid Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		18,000,000	15,900,000
U.S. Benefit Plans | Total | Federal Signal common stock
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	3,600,000
U.S. Benefit Plans | Total | Developed International
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		19,700,000	14,400,000
U.S. Benefit Plans | Total | Equity Securities Emerging Markets
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		6,900,000	10,900,000
U.S. Benefit Plans | Total | US Government Debt Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		3,000,000	1,100,000
U.S. Benefit Plans | Total | Asset-backed Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		7,700,000	7,100,000
U.S. Benefit Plans | Total | Corporate Bond Securities [Member] | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		13,100,000	19,200,000
U.S. Benefit Plans | Total | Fixed Income Mutual Funds [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		700,000	1,200,000
U.S. Benefit Plans | Total | Other Investments Mutual Funds [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		10,500,000	13,900,000
U.S. Benefit Plans | Total | Real Estate [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		4,000,000	3,700,000
U.S. Benefit Plans | Level 1
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		100,100,000	102,600,000
U.S. Benefit Plans | Level 1 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		6,800,000	2,500,000
U.S. Benefit Plans | Level 1 | US Large Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		37,700,000	40,100,000
U.S. Benefit Plans | Level 1 | US Small / Mid Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		18,000,000	15,900,000
U.S. Benefit Plans | Level 1 | Federal Signal common stock
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	3,600,000
U.S. Benefit Plans | Level 1 | Developed International
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		12,800,000	9,900,000
U.S. Benefit Plans | Level 1 | Equity Securities Emerging Markets
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		6,900,000	10,700,000
U.S. Benefit Plans | Level 1 | US Government Debt Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		2,700,000	1,100,000
U.S. Benefit Plans | Level 1 | Asset-backed Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 1 | Corporate Bond Securities [Member] | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 1 | Fixed Income Mutual Funds [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		700,000	1,200,000
U.S. Benefit Plans | Level 1 | Other Investments Mutual Funds [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		10,500,000	13,900,000
U.S. Benefit Plans | Level 1 | Real Estate [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		4,000,000	3,700,000
U.S. Benefit Plans | Level 2
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		28,100,000	31,100,000
U.S. Benefit Plans | Level 2 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 2 | US Large Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		100,000	100,000
U.S. Benefit Plans | Level 2 | US Small / Mid Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 2 | Federal Signal common stock
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 2 | Developed International
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		6,900,000	4,500,000
U.S. Benefit Plans | Level 2 | Equity Securities Emerging Markets
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	200,000
U.S. Benefit Plans | Level 2 | US Government Debt Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		300,000	0
U.S. Benefit Plans | Level 2 | Asset-backed Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		7,700,000	7,100,000
U.S. Benefit Plans | Level 2 | Corporate Bond Securities [Member] | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		13,100,000	19,200,000
U.S. Benefit Plans | Level 2 | Fixed Income Mutual Funds [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 2 | Other Investments Mutual Funds [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 2 | Real Estate [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | US Large Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | US Small / Mid Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Federal Signal common stock
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Developed International
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Equity Securities Emerging Markets
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | US Government Debt Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Asset-backed Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Corporate Bond Securities [Member] | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Fixed Income Mutual Funds [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Other Investments Mutual Funds [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Real Estate [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		54,300,000	59,000,000	$ 62,400,000
Non-U.S. Benefit Plan | Total
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		54,300,000	59,000,000
Non-U.S. Benefit Plan | Total | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		9,200,000	11,500,000
Non-U.S. Benefit Plan | Total | Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		40,100,000	41,900,000
Non-U.S. Benefit Plan | Total | US Government Agencies Debt Securities [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		2,700,000	2,900,000
Non-U.S. Benefit Plan | Total | Company bonds and debt securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		2,300,000	2,700,000
Non-U.S. Benefit Plan | Level 1
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		18,700,000	22,000,000
Non-U.S. Benefit Plan | Level 1 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		9,200,000	11,500,000
Non-U.S. Benefit Plan | Level 1 | Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		5,300,000	6,000,000
Non-U.S. Benefit Plan | Level 1 | US Government Agencies Debt Securities [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		2,700,000	2,900,000
Non-U.S. Benefit Plan | Level 1 | Company bonds and debt securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		1,500,000	1,600,000
Non-U.S. Benefit Plan | Level 2
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		35,600,000	37,000,000
Non-U.S. Benefit Plan | Level 2 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 2 | Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		34,800,000	35,900,000
Non-U.S. Benefit Plan | Level 2 | US Government Agencies Debt Securities [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 2 | Company bonds and debt securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		800,000	1,100,000
Non-U.S. Benefit Plan | Level 3
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 3 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 3 | Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 3 | US Government Agencies Debt Securities [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 3 | Company bonds and debt securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		$ 0	$ 0
[1] Total assets at fair value in the table above exclude a net payable of $0.1 million

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Fair Value Hierarchy Of Plan Assets By Category [Line Items]

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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 35
-Paragraph 50
-URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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-Paragraph 3, 4
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