Acquisitions - Purchase Price Allocations of Acquisitions (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Business Acquisition, Contingent Consideration [Line Items]
Accounts receivable	$ 19,731
Current assets	15,486
Fixed assets	6,097
Intangible assets	339,815
Goodwill	505,438
Other assets	37,888
Total assets acquired	924,455
Current liabilities	13,421
Other liabilities	129,917
Total liabilities assumed	143,338
Net assets acquired	781,117
MediConnect [Member]
Business Acquisition, Contingent Consideration [Line Items]
Accounts receivable	7,077
Current assets	14,918
Fixed assets	1,075
Intangible assets	157,905
Goodwill	223,982
Other assets	17,087
Total assets acquired	422,044
Current liabilities	3,005
Other liabilities	70,634
Total liabilities assumed	73,639
Net assets acquired	348,405
ALP [Member]
Business Acquisition, Contingent Consideration [Line Items]
Accounts receivable	489
Fixed assets	28
Intangible assets	5,736
Goodwill	2,228
Other assets	801
Total assets acquired	9,282
Current liabilities	756
Other liabilities	809
Total liabilities assumed	1,565
Net assets acquired	7,717
Argus [Member]
Business Acquisition, Contingent Consideration [Line Items]
Accounts receivable	12,165
Current assets	568
Fixed assets	4,994
Intangible assets	176,174
Goodwill	279,228
Other assets	20,000
Total assets acquired	493,129
Current liabilities	9,660
Other liabilities	58,474
Total liabilities assumed	68,134
Net assets acquired	$ 424,995