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Once the document is complete, you can send a draft to the client for review and, if needed, set up another call with the client to go over their feedback and answer any questions. If you have an active client who takes the time to really read the document, this call will likely yield some great questions relating to how their workflow will fit into the new system. The needed refinements to the requirements document will be easy to make.
More often than not, however, getting the client to actually review a document—instead of just glancing at the e-mail with the attachment—can be a challenge.
The best way to force your client to review the document is to state very clearly that they must sign off on the requirements document before the project can continue.