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Subsequent Events - Normal Course Issuer Bid (Details) - Common shares	Mar. 01, 2018 shares
Disclosure of classes of share capital [line items]
Repurchase of common shares, number authorized	14,000,000
Authorized repurchase of common shares, percentage of public float	5.00%

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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No definition available.

+ Details

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- Definition

Stock Purchase Agreement, Percentage of Public Float

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

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- Definition

Stock Purchase Agreement, Shares, Number Authorized

+ References

No definition available.

+ Details

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Namespace Prefix:	tac_
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Balance Type:	na
Period Type:	instant

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- Details

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Namespace Prefix:
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