I tried using some third party tools to download TechNet library pages for sccm 2012 sometime ago to read them offline(no internet) but i couldnt grab all the pages :( But now MS has released the technet library pages into .DOCX,PDF and CHM files.
The downloadable files listed on this page contain the product documentation for System Center 2012 Configuration Manager. The available file types include:
More info System Center 2012 Configuration Manager Help Update Wizard (v2.0)
Use the help update wizard to install a local copy of the System Center 2012 Configuration Manager Documentation Library (CHM) which contains a copy of the guides in the TechNet documentation library. This is useful if a computer running the Configuration Manager console does not have Internet access or if you want a standalone copy of the documentation in CHM format. If you run the wizard on a computer running the Configuration Manager console, the wizard will install the local version of the help. If you run the wizard on a computer that does not run the Configuration Manager console, you have the option to save the help file (CHM) to a folder you specify. See the product read-me document for more details.
This technical documentation is also available in the TechNet library.