| **Derivative Financial Instruments - Effect of Derivative Financial Instruments on Income Statement (Detail) (Not Designated as Hedging Instrument, Interest Rate Contract, USD $)In Thousands, unless otherwise specified** | 12 Months Ended |
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| Other Income                                                                                                                                                                                                                 |            |   |
| **Derivative [Line Items]**                                                                                                                                                                                                  |            |   |
| Amount of Gain (Loss) Recognized Income on Derivative                                                                                                                                                                        | $ (79)          | $ (94) |
| Cash Flow Hedging                                                                                                                                                                                                            |            |   |
| **Derivative [Line Items]**                                                                                                                                                                                                  |            |   |
| Amount of Loss Recognized in Other Comprehensive Income on Derivative (Effective Portion)                                                                                                                                    | (1,466)         | (3,274) |
| Cash Flow Hedging | Interest Expense                                                                                                                                                                                         |            |   |
| **Derivative [Line Items]**                                                                                                                                                                                                  |            |   |
| Amount of Loss Reclassified from Other Comprehensive Income Into Income (Effective Portion)                                                                                                                                  | $ (217)         |   |

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| - Definition
The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.
+ References
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| - Definition
The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.
+ References
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| - Definition
The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.
+ References
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