I got the answer...
function GetSelectedValue() {
var selectedValues = [];
$("[id*=CheckBoxList1] input:checked").each(function () {
selectedValues.push($(this).val());
});
if (selectedValues.length > 0) {
var url = '@Url.RouteUrl("MultipleManufacturer", new { manufacturerId = "_documentId_"})';
var finalUrl = url.replace('_documentId_', selectedValues);
window.location.href = finalUrl;
}