Australia is virtually the only western country which imposes a blanket policy of detention. Most other western countries detain unauthorised arrivals for a very short period to verify identity and obtain a security clearance after which they are released into the community on conditions similar to bail release.
The National Legal Eagle: Vol. 3
, Article 6.
Available at: http://epublications.bond.edu.au/nle/vol3/iss2/6