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Nature of Operations (Details)	Dec. 31, 2018
Continuing and discontinued operations [Abstract]
Option to acquire business interest	100.00%

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- Definition

Continuing and discontinued operations [Abstract]

+ References

No definition available.

+ Details

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- Definition

Percentage of Option to Acquire Business Interest

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No definition available.

+ Details

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Namespace Prefix:	agi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant