First Trust North American Energy Infrastructure Fund Average Annual Total Returns |
12 Months Ended | 21 Months Ended | 29 Months Ended | 32 Months Ended | 38 Months Ended | 60 Months Ended | 76 Months Ended | 93 Months Ended | 120 Months Ended | 162 Months Ended | ||||
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| EMLP Blended Benchmark (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||
| Prospectus [Line Items] | ||||||||||||||
| Average Annual Return, Percent | [1] | 13.67% | 17.85% | 11.04% | 9.07% | |||||||||
| S&P 500® Index (reflects no deduction for fees, expenses or taxes)[Member] | ||||||||||||||
| Prospectus [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 17.88% | 17.88% | 21.18% | 23.27% | 23.03% | 22.66% | 14.42% | 16.08% | 14.81% | 14.82% | 14.80% | |||
| First Trust North American Energy Infrastructure Fund | ||||||||||||||
| Prospectus [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 9.70% | 16.46% | 10.62% | 8.76% | ||||||||||
| Performance Inception Date | Jun. 20, 2012 | |||||||||||||
| First Trust North American Energy Infrastructure Fund | After Taxes on Distributions | ||||||||||||||
| Prospectus [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 8.29% | 14.83% | 8.89% | 7.11% | ||||||||||
| First Trust North American Energy Infrastructure Fund | After Taxes on Distributions and Sales | ||||||||||||||
| Prospectus [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 5.73% | 12.42% | 7.71% | 6.25% | ||||||||||
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