I can think of 3 options:
1. use icc -help as Tim mentioned
2. use "man icc"
3. use document "User and Reference Guide for the Intel® C++ Compiler 15.0" (https://software.intel.com/en-us/node/522788)
You may also use the local installation of the document and it is much easier to search for a specific option with "index", see below: