The size of Detention is approximately 1.4 square kilometres. It has 3 parks covering nearly 15.1% of total area. The population of Detention in 2006 was 381 people. By 2011 the population was 218 showing a population decline of 42.8% in the area during that time. The predominant age group in Detention is 40-49 years. Households in Detention are primarily childless couples and are likely to be repaying $1000 - $1399 per month on mortgage repayments. In general, people in Detention work in a managers occupation. In 2006, 77.6% of the homes in Detention were owner-occupied compared with 74.7% in 2011.