Commitments and Contingencies (Details) (One-time incentive fee, Columbus Nova, USD $)	Mar. 31, 2013	Dec. 31, 2012
One-time incentive fee \| Columbus Nova
Commitments and Contingencies
Fair value of incentive fee	$ 0	$ 0

Represents the fair value of incentive fee payable by the entity.

No definition available.

Name:	stag_IncentiveFeeFairValue
Namespace Prefix:	stag_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant