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Amounts Recognized in AOCI (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning balance, net of income tax | $ 4,533,220 |  |
Other comprehensive income (loss), Pretax amount | 35,258 | $ 2,360 | $ 5,083
Other comprehensive income (loss), Income tax effect | (2,664) | (4,648) | (2,980)
Total other comprehensive income (loss), net of tax | 32,594 | (2,288) | 2,103
Ending balance, net of income tax | 4,989,514 | 4,533,220 |
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning balance, net of income tax | 19 | (776) |
Other comprehensive income (loss), Pretax amount | 6,679 | 1,271 |
Other comprehensive income (loss), Income tax effect | (2,490) | (476) |
Total other comprehensive income (loss), net of tax | 4,189 | 795 |
Ending balance, net of income tax | 4,208 | 19 | (776)
Foreign Currency Translation Adjustment |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning balance, net of income tax | (14,197) | (4,159) |
Other comprehensive income (loss), Pretax amount | 26,678 | (10,038) |
Total other comprehensive income (loss), net of tax | 26,678 | (10,038) |
Ending balance, net of income tax | 12,481 | (14,197) | (4,159)
Unrealized Loss on Marketable Security |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning balance, net of income tax | (1,398) |  |
Other comprehensive income (loss), Pretax amount | (2,169) | (2,229) |
Other comprehensive income (loss), Income tax effect | 809 | 831 |
Total other comprehensive income (loss), net of tax | (1,360) | (1,398) |
Ending balance, net of income tax | (2,758) | (1,398) |
Minimum Pension Liability |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning balance, net of income tax | (9,841) | (18,194) |
Other comprehensive income (loss), Pretax amount | 4,070 | 13,356 |
Other comprehensive income (loss), Income tax effect | (983) | (5,003) |
Total other comprehensive income (loss), net of tax | 3,087 | 8,353 |
Ending balance, net of income tax | (6,754) | (9,841) | (18,194)
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning balance, net of income tax | (25,417) | (23,129) |
Ending balance, net of income tax | $ 7,177 | $ (25,417) | $ (23,129)

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