Preliminary Purchase Price and Related Allocations (Detail) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2012
Air Serv
Purchase price:
Total cash consideration	$ 158,747
Allocated to:
Cash and cash equivalents	10,702
Trade accounts receivable	52,838
Prepaid expenses and other	5,059
Property, plant and equipment	18,872
Other intangible assets	44,500
Goodwill	88,205
Trade accounts payable	(4,604)
Accrued liabilities	(24,457)
Insurance claims	(8,901)
Net deferred income tax liabilities	(17,212)
Other	(6,255)
Net assets acquired	158,747
HHA
Purchase price:
Total cash consideration	34,323
Allocated to:
Cash and cash equivalents	832
Trade accounts receivable	3,175
Prepaid expenses and other	927
Property, plant and equipment	123
Other intangible assets	12,000
Goodwill	26,013
Other assets	468
Trade accounts payable	(665)
Accrued liabilities	(4,321)
Net deferred income tax liabilities	(4,212)
Other	(17)
Net assets acquired	34,323
Calvert-Jones
Purchase price:
Total cash consideration	6,250
Allocated to:
Trade accounts receivable	1,479
Prepaid expenses and other	601
Property, plant and equipment	49
Other intangible assets	2,600
Goodwill	3,889
Trade accounts payable	(1,200)
Accrued liabilities	(864)
Other	(304)
Net assets acquired	$ 6,250