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Business Combinations - Summary of Estimated Fair Values of Net Assets Acquired (Detail)
$ in Millions
Mar. 31, 2017
USD ($)
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash $ 2.2
Other current assets 11.1
Fixed assets 1.1
Noncurrent assets 0.2
Goodwill 91.9
Expiration lists 105.1
Non-compete agreements 1.0
Total assets acquired 212.6
Current liabilities 10.3
Noncurrent liabilities 5.5
Total liabilities assumed 15.8
Total net assets acquired 196.8
Construction Risk Solutions, LLC [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 3.6
Goodwill 12.3
Expiration lists 22.7
Non-compete agreements 0.1
Total assets acquired 38.7
Current liabilities 3.2
Total liabilities assumed 3.2
Total net assets acquired 35.5
Hill, Chesson And Woody [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 2.1
Noncurrent assets 0.2
Goodwill 26.2
Expiration lists 22.3
Non-compete agreements 0.4
Total assets acquired 51.2
Current liabilities 0.1
Total liabilities assumed 0.1
Total net assets acquired 51.1
Presidio Group, Inc. [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Other current assets 2.4
Fixed assets 0.5
Goodwill 25.0
Expiration lists 26.8
Non-compete agreements 0.3
Total assets acquired 55.0
Current liabilities 2.9
Total liabilities assumed 2.9
Total net assets acquired 52.1
Nine Other Acquisitions [Member]  
Business Acquisition Actual Revenue And Pre Tax Income Loss [Line Items]  
Cash 2.2
Other current assets 3.0
Fixed assets 0.6
Goodwill 28.4
Expiration lists 33.3
Non-compete agreements 0.2
Total assets acquired 67.7
Current liabilities 4.1
Noncurrent liabilities 5.5
Total liabilities assumed 9.6
Total net assets acquired $ 58.1