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Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Gain or (Loss) Recognized from AOCIL into Earnings, Net of Tax |  | $ 1,451 | [1],[2] | $ 1,817 | $ 1,817 |  |  |  |  | $ 5,085 | [1],[2] |  |
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax |  | (11,379) | [3] | (18,827) | (11,555) |  |  |  |  | (41,761) | [3] |  |
Foreign currency translation adjustment, gross |  | (24,911) |  |  |  | $ 35,455 |  |  |  | 60,404 |  | $ (67,349) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total |  | (24,911) |  | 43,135 | 42,180 | 35,455 |  | $ (43,474) | $ (59,330) |  |  | (67,349) |
Other Comprehensive Income (Loss), before Tax |  | (42,367) |  |  |  |  |  |  |  | (3,332) |  |  |
Other Comprehensive Income (Loss), Tax |  | (4,626) |  |  |  | 985 |  |  |  | (16,890) |  | 4,405 |
Other comprehensive income (loss), net of tax |  | (37,741) |  |  |  | 38,097 |  |  |  | 13,558 |  | (55,210) |
Other comprehensive income (loss), gross total, before ASU 2017-12 |  |  |  |  |  | 39,082 |  |  |  |  |  | (50,805) |
Income tax (benefit) expense related to items of other comprehensive income loss |  |  |  |  |  | (985) |  |  |  |  |  | (4,405) |
Amounts reclassified, net of tax |  |  |  |  |  | (1,786) | [1],[2] | 2,204 | 1,303 |  |  | 1,721 | [1],[2]
Changes in fair value, net of taxes |  |  |  |  |  | 856 | [3] | 3,890 | 9,114 |  |  | 13,860 | [3]
Other comprehensive income (loss), total, net of tax |  |  |  |  |  | 38,097 |  |  |  |  |  | (55,210) |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Gain or (Loss) Recognized from AOCIL into Earnings, Net of Tax |  | 1,451 |  | 1,817 | 1,817 |  |  |  |  |  |  |  |
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax |  | (11,379) |  | (18,827) | (11,555) |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total |  | (24,911) |  | $ 43,135 | $ 42,180 | 35,455 |  | (43,474) | (59,330) | 60,404 |  |  |
Amounts reclassified, net of tax |  |  |  |  |  | (1,786) |  | 2,204 | 1,303 |  |  |  |
Changes in fair value, net of taxes |  |  |  |  |  | 856 |  | $ 3,890 | $ 9,114 |  |  |  |
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment, gross |  | (24,911) |  |  |  | 35,455 |  |  |  | 60,404 |  | (67,349) |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total |  | (24,911) |  |  |  | 35,455 |  |  |  | 60,404 |  | (67,349) |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax |  | (1,974) |  |  |  |  |  |  |  | (6,918) |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax |  | (15,482) |  |  |  |  |  |  |  | (56,818) |  |  |
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax | [3] | (11,379) |  |  |  |  |  |  |  | (41,761) |  |  |
Amounts reclassified, gross |  |  |  |  |  | 4,279 |  |  |  |  |  | 2,407 |
Changes in fair value, gross |  |  |  |  |  | 863 |  |  |  |  |  | 15,828 |
Amounts reclassified, net of tax |  |  |  |  |  |  |  |  |  |  |  | (1,769) |
Changes in fair value, net of taxes | [3] |  |  |  |  | 634 |  |  |  |  |  | 11,634 |
Interest Rate Swap [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax |  | (1,974) |  |  |  |  |  |  |  | (6,918) |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax |  | 523 |  |  |  |  |  |  |  | 1,833 |  |  |
Amount of Gain or (Loss) Recognized from AOCIL into Earnings, Net of Tax |  | (1,451) |  |  |  |  |  |  |  | (5,085) |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax |  | (15,482) |  |  |  |  |  |  |  | (56,818) |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax |  | 4,103 |  |  |  |  |  |  |  | 15,057 |  |  |
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax |  | (11,379) |  |  |  |  |  |  |  | (41,761) |  |  |
Interest Rate Swap [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified, gross |  |  |  |  |  | 4,279 |  |  |  |  |  | 2,407 |
Changes in fair value, gross |  |  |  |  |  | 863 |  |  |  |  |  | 15,828 |
Amounts reclassified, tax effect |  |  |  |  |  | (1,134) |  |  |  |  |  | (638) |
Changes in fair value, tax effect |  |  |  |  |  | (229) |  |  |  |  |  | (4,194) |
Amounts reclassified, net of tax |  |  |  |  |  | 3,145 |  |  |  |  |  | 1,769 |
Changes in fair value, net of taxes |  |  |  |  |  | 634 |  |  |  |  |  | 11,634 |
Fuel [Member] | Commodity Contract [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax |  | 0 |  |  |  |  |  |  |  | 0 |  |  |
Amounts reclassified, gross |  |  |  |  |  | (1,810) |  |  |  |  |  | (4,647) |
Changes in fair value, gross |  |  |  |  |  | 295 |  |  |  |  |  | 2,956 |
Amounts reclassified, net of tax |  |  |  |  |  |  |  |  |  |  |  | 3,490 |
Changes in fair value, net of taxes | [3] |  |  |  |  | 222 |  |  |  |  |  | 2,226 |
Fuel [Member] | Commodity Contract [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amounts reclassified, gross |  |  |  |  |  | (1,810) |  |  |  |  |  | (4,647) |
Changes in fair value, gross |  |  |  |  |  | 295 |  |  |  |  |  | 2,956 |
Amounts reclassified, tax effect |  |  |  |  |  | 451 |  |  |  |  |  | 1,157 |
Changes in fair value, tax effect |  |  |  |  |  | (73) |  |  |  |  |  | (730) |
Amounts reclassified, net of tax |  |  |  |  |  | (1,359) |  |  |  |  |  | (3,490) |
Changes in fair value, net of taxes |  |  |  |  |  | 222 |  |  |  |  |  | 2,226 |
Interest Expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Gain or (Loss) Recognized from AOCIL into Earnings, Net of Tax | [1],[2] | 1,451 |  |  |  |  |  |  |  | 5,085 |  |  |
Amounts reclassified, net of tax | [1],[2] |  |  |  |  | (3,145) |  |  |  |  |  | (1,769) |
Cost of Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of Gain or (Loss) Recognized from AOCIL into Earnings, Net of Tax |  | $ 0 |  |  |  |  |  |  |  | $ 0 |  |  |
Amounts reclassified, net of tax | [1],[2] |  |  |  |  | $ 1,359 |  |  |  |  |  | $ 3,490 |
[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.

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