Amounts Recognized in AOCI (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance, net of income tax	$ 4,989,514
Other comprehensive income (loss), Pretax amount	4,419	$ 35,258	$ 2,360
Other comprehensive income (loss), Income tax effect	(8,905)	(2,664)	(4,648)
Other comprehensive income (loss), Income tax effect, net of adoption of ASU 2018-02	(7,354)
Total other comprehensive income (loss), net of tax	(4,486)	32,594	(2,288)
Total other comprehensive income (loss), Change, net of income tax and ASU 2018-02	(2,935)
Ending balance, net of income tax	5,389,262	4,989,514
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance, net of income tax	4,208	19
Other comprehensive income (loss), Pretax amount	(2,805)	6,679
Other comprehensive income (loss), Income tax effect		(2,490)
Other comprehensive income (loss), Income tax effect, net of adoption of ASU 2018-02	1,577
Total other comprehensive income (loss), net of tax		4,189
Total other comprehensive income (loss), Change, net of income tax and ASU 2018-02	(1,228)
Ending balance, net of income tax	2,980	4,208	19
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance, net of income tax	12,481	(14,197)
Other comprehensive income (loss), Pretax amount	9,718	26,678
Other comprehensive income (loss), Income tax effect, net of adoption of ASU 2018-02	(6,824)
Total other comprehensive income (loss), net of tax		26,678
Total other comprehensive income (loss), Change, net of income tax and ASU 2018-02	2,894
Ending balance, net of income tax	15,375	12,481	(14,197)
Unrealized Loss on Marketable Security
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance, net of income tax	(2,758)	(1,398)
Other comprehensive income (loss), Pretax amount	4,398	(2,169)
Other comprehensive income (loss), Income tax effect		809
Other comprehensive income (loss), Income tax effect, net of adoption of ASU 2018-02	(1,640)
Total other comprehensive income (loss), net of tax		(1,360)
Total other comprehensive income (loss), Change, net of income tax and ASU 2018-02	2,758
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	(6,754)	(9,841)
Other comprehensive income (loss), Pretax amount	(6,892)	4,070
Other comprehensive income (loss), Income tax effect		(983)
Other comprehensive income (loss), Income tax effect, net of adoption of ASU 2018-02	(467)
Total other comprehensive income (loss), net of tax		3,087
Total other comprehensive income (loss), Change, net of income tax and ASU 2018-02	(7,359)
Ending balance, net of income tax	(14,113)	(6,754)	(9,841)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance, net of income tax	7,177	(25,417)
Ending balance, net of income tax	$ 4,242	$ 7,177	$ (25,417)