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Derivative Instruments - Effective Portion of Gains (Losses) on Interest Rate Swap Agreements (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Derivative [Line Items]  
Balance Sheet (AOCI), Effective Portion $ (65)
Statement of Income (Loss), Effective Portion 2,613
Ineffective Portion (1,050)
Interest Expense [Member]  
Derivative [Line Items]  
Balance Sheet (AOCI), Effective Portion (65)
Ineffective Portion $ (1,050)