This should give you a good idea of what's in store should you choose to purchase what is probably the best global-level strategy game ever devised.
The manual for Hearts Of Iron II is such a size, but even when you've waded through this tome, the author actually stresses that his guide is a mere introduction, rather than an exhaustive point of referral. When a game comes with a instruction booklet, you know you're getting something with some degree of depth.