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Fair Values of Derivative Instruments on Condensed Consolidated Balance Sheet (Detail) - USD ($) | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Interest Rate Swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative financial instruments, Liability | $ 7,600,000 | $ 2,600,000
Parent Company [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Asset Derivatives, Fair Value | 2,000,000 | 2,400,000
Derivative financial instruments, Liability | $ 2,602,000 | $ 7,562,000

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