He is the Principal of the Quantum Pacific Group, a Guernsey-based holding corporation. He is also the majority shareholder of Pacific Drilling, a public company listed on the New York Stock Exchange, and the Israel Corporation, the largest public holding listed on the Tel Aviv Stock Exchange. He served as the Chairman of the Israel Corporation from 1999 to 2010, and as a member of its Board of Directors from 1999 to 2013. He has served on the Advisory Boards of Synergy Ventures and Aspect Enterprise Solutions. He was an investor in Better Place, an electric car company which went bankrupt in May 2013.
Shortly after his father's death in 2011, he inherited half his father's fortune. Additionally, he inherited half of his father's "vast collection" of modern art. As a result, by 2013, he was the richest man in Israel. According to Forbes, Idan Ofer has a net worth of $4.1 billion, as of January 2015.
He has been married four times. His fourth wife is Batia Ofer, a philanthropist, who serves on the advisory board of Sotheby's. He has five children. They resided in Arsuf, near Tel Aviv, until 2013. His daughter, Leigh Ofer resides in New York City; his other children reside in London.
In 2014, he established Kenon Holdings as a spin off from the Israel Corporation. It is a holding company primarily focused on growth-orientated businesses in the Automotive and Energy industries. It inherited some of the Investments previously held by the Israel Corporation, such as Qoros, a joint project created in partnership with Chery Automobile that manufactures automobiles aimed towards a ‘young, internationally-minded’ market in China. Other Investments include Zim Integrated Shipping Services and IC Power. It also includes Inkia Energy, a Peruvian Energy company and subsidiary of the IC Power. Meanwhile, the Israel Corporation retains Investments in Oil Refineries and Israel Chemicals.