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Derivative Financial Instruments - Summary of Changes in AOCL (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 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 $ 113 458 $ 309
Unrealized (loss) gain from changes in the fair value of the effective portion of the interest rate swaps   (7)   74
Amount included in other comprehensive income 229 106 458 383
Accumulated other comprehensive loss end of period 2,041,920   2,041,920  
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 (6,646) (7,310) (6,875) (7,587)
Accumulated other comprehensive loss end of period $ (6,417) $ (7,204) $ (6,417) $ (7,204)