Business Combinations - Summary of Effect on Goodwill from Changes in Derivative Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Array Financial Group, Inc. [Member]	Dec. 31, 2013 Array Financial Group, Inc. [Member]	Jun. 30, 2014 Array Financial Group, Inc. [Member] Other Assets [Member]	Jun. 30, 2014 Array Financial Group, Inc. [Member] Other Liabilities [Member]
Business Acquisition [Line Items]
Beginning Balance	$ 32,235	$ 3,954	$ 4,089
Effect of adjustments	135			(338)	203
Ending Balance	$ 32,100	$ 3,954	$ 4,089