.form-horizontal .form-group

https://github.com/twbs/bootstrap/pull/10000

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<div class="container">
    <div class="row">
        <div class="col-md-3" style="background:#EEEEEE">
            <p>foo</p>
        </div>
    
        <div class="col-md-3" style="background:#FFFFCC">
            <div class="form-horizonal">
                <div class="form-group">
                    <div class="checkbox col-md-1">
                        <label for="expense">
                            <input type="checkbox" name="expense" id="expense"/> Exp
                        </label>
                    </div>
                    <span class="col-md-6">
                        <input data-bind="value: expenseAmount" class="form-control" type="text" name="expenseAmount" id="expenseAmount" maxlength="12"/>
                    </span>
                </div>
            </div>                    
        </div>

        <div class="col-md-6" style="background:#F0F8FF">
            <p>Bar</p>
        </div>

    </div>
</div>