Three parshiot contain numerous details about Avraham. We learn about his leaving his parents' home, his travelling to Egypt & Gerara among other places, the problems with Hagar and Yishma'el, binding Isaac to the alter, and other stories.
Seven parshiot mention Ya'akov from Toldot (story of his getting the blessing instead of Esav), his travails with Lavan in Vayetze, His dealing with Esav in Vayishlach, there's a bit of a "break" from Vayeshev through Miketz as the focus is mainly on Yosef, but things continue in Vayigash when he comes down to Egypt and his blessings to his children and burial in Vayechi.
By comparison, little is said about Yitzchak. We read about his birth and akeida in Vayeira, he gets married to Rivkah in Chayei Sarah (very little mentioning of him, in this parsha). Toldot seems to be the main parsha were we seem most of his activity, then, near the end of the parsha, we see he is about to die. There's very little mentioned about him in comparsion to his father and his son.
Why does the Torah spend little time talking about him? Was there so little that occurred to him by comparison?
Feel free to improve the tagging. Offhand, I didn't think of including all the various parshiot, as I'm not really asking about something specific to any parsha.