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Fair Values of Derivative Instruments on Condensed Consolidated Balance Sheet (Detail) - Parent Company [Member] - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value $ 2,000 $ 6,000
Derivative financial instruments, Liability $ 12,257,000 $ 10,358,000