Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments - Summary of Changes in AOCL (Detail)

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Derivative Financial Instruments - Summary of Changes in AOCL (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]    
Accumulated other comprehensive loss beginning of period $ 2,057,737  
Realized loss reclassified from accumulated other comprehensive loss to interest expense 229 $ 196
Unrealized gain from changes in the fair value of the effective portion of the interest rate swaps   81
Amount included in other comprehensive income 229 277
Accumulated other comprehensive loss end of period 2,046,891  
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Accumulated other comprehensive loss beginning of period (6,875) (7,587)
Accumulated other comprehensive loss end of period $ (6,646) $ (7,310)