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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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- Definition 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 -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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