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Accumulated other comprehensive income (loss) - Schedule of Accumulated Other Comprehensive Income (loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Jan. 01, 2019 | Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Beginning Balance |  |  | $ 3,697,522 | $ 3,320,100 | $ 3,320,100 |  |
Cumulative catch-up adjustment related to adoption of ASU 2017-12 on tax effects in AOCI (note 2(a)) |  |  |  |  |  | $ 186 |
OCI before reclassifications |  |  | 19,289 |  | (22,875) |  |
Amounts reclassified |  |  | 3,546 |  | (4,343) |  |
Other comprehensive income (loss), net of tax | $ 9,517 | $ (5,996) | 25,540 | (12,295) | (28,699) |  |
Ending Balance | 3,917,170 |  | 3,917,170 |  | 3,697,522 |  |
Foreign currency cumulative translation |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Beginning Balance |  |  | (74,189) | (47,701) | (47,701) |  |
OCI before reclassifications |  |  | 9,250 |  | (26,488) |  |
Amounts reclassified |  |  | 0 |  | 0 |  |
Other comprehensive income (loss), net of tax |  |  | 9,250 |  | (26,488) |  |
Ending Balance | (64,939) |  | (64,939) |  | (74,189) |  |
Change in fair value of cash flow hedges |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Beginning Balance |  |  | 64,333 | 55,366 | 55,366 |  |
OCI before reclassifications |  |  | 10,087 |  | 1,567 |  |
Amounts reclassified |  |  | 3,543 |  | (4,257) |  |
Other comprehensive income (loss), net of tax |  |  | 13,630 |  | (2,690) |  |
Ending Balance | 78,149 |  | 78,149 |  | 64,333 |  |
Pension and post-employment actuarial changes |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Beginning Balance |  |  | (9,529) | (10,457) | (10,457) |  |
OCI before reclassifications |  |  | (48) |  | 2,046 |  |
Amounts reclassified |  |  | 3 |  | (86) |  |
Other comprehensive income (loss), net of tax |  |  | (45) |  | 1,960 |  |
Ending Balance | (9,574) |  | (9,574) |  | (9,529) |  |
Accumulated OCI |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Beginning Balance |  |  | (19,385) | $ (2,792) | (2,792) |  |
Cumulative catch-up adjustment related to adoption of ASU 2017-12 on tax effects in AOCI (note 2(a)) |  |  |  |  |  | 186 |
Other comprehensive income (loss), net of tax |  |  | 22,835 |  | (27,218) |  |
Ending Balance | $ 3,636 |  | $ 3,636 |  | $ (19,385) |  |
Accounting Standards Update 2018-02 |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Cumulative catch-up adjustment related to adoption of ASU 2017-12 on tax effects in AOCI (note 2(a)) |  |  |  |  |  |  | $ 10,625
Accounting Standards Update 2018-02 | Foreign currency cumulative translation |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Cumulative catch-up adjustment related to adoption of ASU 2017-12 on tax effects in AOCI (note 2(a)) |  |  |  |  |  |  | 0
Accounting Standards Update 2018-02 | Change in fair value of cash flow hedges |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Cumulative catch-up adjustment related to adoption of ASU 2017-12 on tax effects in AOCI (note 2(a)) |  |  |  |  |  |  | 11,657
Accounting Standards Update 2018-02 | Pension and post-employment actuarial changes |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Cumulative catch-up adjustment related to adoption of ASU 2017-12 on tax effects in AOCI (note 2(a)) |  |  |  |  |  |  | (1,032)
Accounting Standards Update 2018-02 | Accumulated OCI |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Cumulative catch-up adjustment related to adoption of ASU 2017-12 on tax effects in AOCI (note 2(a)) |  |  |  |  |  |  | $ 10,625
Accounting Standards Update 2018-12 | Foreign currency cumulative translation |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Cumulative catch-up adjustment related to adoption of ASU 2017-12 on tax effects in AOCI (note 2(a)) |  |  |  |  |  | 0 |
Accounting Standards Update 2018-12 | Change in fair value of cash flow hedges |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Cumulative catch-up adjustment related to adoption of ASU 2017-12 on tax effects in AOCI (note 2(a)) |  |  |  |  |  | 186 |
Accounting Standards Update 2018-12 | Pension and post-employment actuarial changes |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |  |  |  |
Cumulative catch-up adjustment related to adoption of ASU 2017-12 on tax effects in AOCI (note 2(a)) |  |  |  |  |  | $ 0 |

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