Professional Arabic Translation required

We require a professional translator to translate documents from English-Arabic, the translation should be professional and in a way that makes sense, so not a word-by-word translation. Each document teaches a topic (i.e. Project management, gardening, presentation skills,etc..) and the content of each document is around 40 pages (8,000-10,000 words) We would like to work in contract basis as we will have above 40-50 documents in the long run, so please do not bid per page or word, you bid should be for 1 full document that has the criteria mentioned above. Please note that your translated document will be checked against machine-translation websites and tools as we are looking for an authentic and original translation. To be shortlisted and contacted, you will have to submit previous sample work. Thank you