A 52-year-old man with a known left inguinal hernia presents to the emergency department with acute onset severe left groin pain, abdominal distension, and bilious vomiting for 6 hours. On examination, the hernia is tender, irreducible, and tense. Abdominal examination reveals distension with visible peristaltic waves. Plain abdominal X-ray shows small bowel obstruction with air-fluid levels. What is the most appropriate immediate next step in management?