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Impact of Derivative Financial Instruments (Detail) - Interest Expense - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative [Line Items]        
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) $ 5,280 $ (2,787) $ 14,381 $ (733)
Amounts Reclassified from Accumulated OCI into Income (Effective Portion) $ (551) $ 590 $ (248) $ 1,795