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Business Combinations (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2013 Business	Mar. 31, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Aggregate purchase price in cash	$ 5.3
Contingent consideration	1.2
Number of business acquired	4us-gaap_NumberOfBusinessesAcquired
Loan Quality Analytics
Business Acquisition [Line Items]
Acquisition purchase price		151.2
Additional Acquisitions
Business Acquisition [Line Items]
Acquisition purchase price			$ 11.3