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 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]          
Accumulated other comprehensive loss beginning of period     $ 2,028,323    
Realized loss reclassified from accumulated other comprehensive loss to interest expense $ 54 $ 758 363 $ 2,835  
Unrealized gain (loss) from changes in the fair value of the effective portion of the interest rate swaps 46 44 120 (174)  
Gain included in other comprehensive loss 100 802 483 2,661  
Accumulated other comprehensive loss end of period 2,009,561   2,009,561   $ 2,028,323
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 (7,204) (19,616) (7,587) (21,475) (21,475)
Accumulated other comprehensive loss end of period $ (7,104) $ (18,814) $ (7,104) $ (18,814) $ (7,587)