Discontinued Operations - Additional Information (Detail) (LeTourneau Technologies, Inc. [Member], USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Oct. 24, 2011	Oct. 26, 2012
LeTourneau Technologies, Inc. [Member]
Discontinued Operations [Line Items]
Sale of drilling products	$ 375.0
Payment for post closing working capital adjustment		56.3
loss on sale of supply agreements	$ 23.3