Derivative Financial Instruments - Fair Value of Derivative Instruments (Detail) - Derivatives Not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	$ 4,819	$ 5,783
Other Liabilities [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives	4,819	5,783
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	4,819	5,783
Other Assets [Member] | Interest Rate Swaps [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives	$ 4,819	$ 5,783