PORTLAND, Ore. — Details of decades of sexual abuse in the Boy Scouts of America, and what child welfare experts say was a corrosive culture of secrecy that compounded the damage, were cast into full public view for the first time on Thursday with the release of thousands of pages of documents describing abuse accusations across the country.

“The secrets are out,” said Kelly Clark, a lawyer whose firm obtained the files as evidence in an $18.5 million civil judgment against the Scouts in 2010. The legal effort to make the files public, by a group of national and local media outlets, including The New York Times — and represented by another lawyer, Charles F. Hinkle — resulted in an Oregon Supreme Court decision in June ordering full release. Mr. Clark said in a news conference that the database would be sortable by state, year and name.

Officials with the Boy Scouts fought in the courts for years to prevent the release of the documents — more than 15,000 pages detailing accusations of sexual abuse against 1,247 scout leaders between 1965 and 1985, with thousands of victims involved, perhaps many thousands — contending that fear of breached confidentiality could inhibit victims from reporting other instances of abuse.

But even as the court fight proceeded, scouting officials were also restructuring the organization’s system of reporting abuse and promised to look back through other old files not released publicly. If evidence is found of past criminal wrongdoing by scout leaders, they say, it will be presented to law enforcement agencies. Thursday’s release followed several stories in The Los Angeles Times involving a separate cache of files that also revealed failures to protect scouts.