Acquisitions - Preliminary Fair Value of Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 26, 2012
LeTourneau Technologies, Inc. [Member]
Assets Acquired:
Cash and cash equivalents	$ 4,769
Accounts receivable	52,910
Inventories	200,050
Other current assets	187
Current assets of discontinued operations	331,412
Property, plant and equipment	106,394
Other intangible assets and goodwill	565,388
Other non-current assets	14,459
Non-current assets of discontinued operations	226,844
Total assets acquired	1,502,413
Liabilities Assumed:
Accounts payable	(37,217)
Employee compensation and benefits	(10,576)
Advance payments and progress billings	(97,228)
Other accrued liabilities	(120,459)
Current liabilities of discontinued operations	(183,256)
Total liabilities assumed	(448,736)
Net assets acquired	1,053,677
International Mining Machinery Holdings Ltd. [Member]
Assets Acquired:
Cash and cash equivalents	72,912
Accounts receivable	202,825
Inventories	91,176
Other current assets	15,622
Property, plant and equipment	125,600
Other intangible assets and goodwill	1,149,787
Other non-current assets	40,327
Total assets acquired	1,698,249
Liabilities Assumed:
Short-term notes payable	(14,666)
Accounts payable	(87,305)
Employee compensation and benefits	(6,458)
Advance payments and progress billings	(6,122)
Other accrued liabilities	(54,545)
Other non-current liabilities	(105,715)
Total liabilities assumed	(274,811)
Net assets acquired	$ 1,423,438