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Other Comprehensive Income (Loss) (Amounts Included in Accumulated Other Comprehensive Income (Loss)) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Components of Other Comprehensive Income (Loss) [Line Items]            
Stockholders' Equity Attributable to Parent, Beginning Balance   $ 6,454,608     $ 6,454,608  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax $ 43,135 42,180 $ (43,474) $ (59,330)   $ (102,804)
Stockholders' Equity Attributable to Parent, Ending Balance 6,702,396       6,702,396  
Beginning balance       108,413   108,413
Derivatives designated as cash flow hedges, liability derivatives, before ASU 2017-12     2,204 [1],[2] 1,303   3,507 [1],[2]
Derivatives designated as cash flow hedges, asset derivatives, before ASU 2017-12     3,890 [3] 9,114   13,004 [3]
Foreign currency translation adjustment 43,135 42,180 (43,474) (59,330)   (102,804)
Ending balance     15,106     15,106
Interest Rate Swap [Member]            
Components of Other Comprehensive Income (Loss) [Line Items]            
Beginning balance       13,951   13,951
Derivatives designated as cash flow hedges, liability derivatives, before ASU 2017-12           1,376
Derivatives designated as cash flow hedges, asset derivatives, before ASU 2017-12 [3]     2,349     11,000
Ending balance     23,575     23,575
Foreign Currency Translation Adjustment [Member]            
Components of Other Comprehensive Income (Loss) [Line Items]            
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax           (102,804)
Beginning balance       91,555   91,555
Foreign currency translation adjustment           (102,804)
Ending balance     (11,249)     (11,249)
Fuel [Member] | Commodity Contract [Member]            
Components of Other Comprehensive Income (Loss) [Line Items]            
Beginning balance       2,907   2,907
Derivatives designated as cash flow hedges, liability derivatives, before ASU 2017-12           2,131
Derivatives designated as cash flow hedges, asset derivatives, before ASU 2017-12 [3]     1,541     2,004
Ending balance     2,780     2,780
Accumulated Other Comprehensive Income (Loss) [Member]            
Components of Other Comprehensive Income (Loss) [Line Items]            
Stockholders' Equity Attributable to Parent, Beginning Balance   (74,786)     (74,786)  
Amounts reclassified into earnings         (3,634)  
Change in fair value         (30,382)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 43,135 42,180 (43,474) (59,330) 85,315  
Stockholders' Equity Attributable to Parent, Ending Balance (23,487)       (23,487)  
Derivatives designated as cash flow hedges, liability derivatives, before ASU 2017-12     2,204 1,303    
Derivatives designated as cash flow hedges, asset derivatives, before ASU 2017-12     3,890 9,114    
Foreign currency translation adjustment 43,135 42,180 (43,474) $ (59,330) 85,315  
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Interest Rate Swap [Member]            
Components of Other Comprehensive Income (Loss) [Line Items]            
Stockholders' Equity Attributable to Parent, Beginning Balance   8,892     8,892  
Amounts reclassified into earnings         (3,634)  
Change in fair value         (30,382)  
Stockholders' Equity Attributable to Parent, Ending Balance (25,124)       (25,124)  
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]            
Components of Other Comprehensive Income (Loss) [Line Items]            
Stockholders' Equity Attributable to Parent, Beginning Balance   $ (83,678)     (83,678)  
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax 43,135   (43,474)   85,315 (102,804)
Stockholders' Equity Attributable to Parent, Ending Balance 1,637       1,637  
Foreign currency translation adjustment $ 43,135   $ (43,474)   $ 85,315 $ (102,804)
[1] Amounts reclassified from AOCIL into earnings related to realized gains and losses on interest rate swaps are recognized when interest payments or receipts occur related to the swap contracts, which correspond to when interest payments are made on the Company’s hedged debt.
[2] Amounts reclassified from AOCIL into earnings related to realized gains and losses on the fuel hedges are recognized when settlement payments or receipts occur related to the hedge contracts, which correspond to when the underlying fuel is consumed.
[3] In accordance with the derivatives and hedging guidance, the changes in fair values of interest rate swaps and fuel hedges have been recorded in equity as a component of AOCIL. As the critical terms of the interest rate swaps match the underlying debt being hedged, all unrealized changes in fair value are recorded in AOCIL. Because changes in the actual price of diesel fuel and changes in the DOE index price did not offset exactly each reporting period, the Company assessed whether the fuel hedges were highly effective using the cumulative dollar offset approach.