Amounts Recognized in AOCI (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance, net of income tax	$ 5,389,262
Other comprehensive income (loss), Pretax amount	32,464	$ 4,419	$ 35,258
Other comprehensive income (loss), Income tax effect	(4,813)	(8,905)	(2,664)
Total other comprehensive income (loss), net of tax	27,651	(4,486)	32,594
Other comprehensive income (loss), Income tax effect, net of adoption of ASU 2018-02		(7,354)
Total other comprehensive income (loss), Change, net of income tax and ASU 2018-02		(2,935)
Ending balance, net of income tax	5,504,105	5,389,262
Net Unrealized Gains (Losses) on Effective Cash Flow Hedges
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance, net of income tax	2,980	4,208
Other comprehensive income (loss), Pretax amount	(3,925)	(2,805)
Other comprehensive income (loss), Income tax effect	928
Total other comprehensive income (loss), net of tax	(2,997)
Other comprehensive income (loss), Income tax effect, net of adoption of ASU 2018-02		1,577
Total other comprehensive income (loss), Change, net of income tax and ASU 2018-02		(1,228)
Ending balance, net of income tax	(17)	2,980	4,208
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance, net of income tax	15,375	12,481
Other comprehensive income (loss), Pretax amount	27,886	9,718
Other comprehensive income (loss), Income tax effect	(3,693)
Total other comprehensive income (loss), net of tax	24,193
Other comprehensive income (loss), Income tax effect, net of adoption of ASU 2018-02		(6,824)
Total other comprehensive income (loss), Change, net of income tax and ASU 2018-02		2,894
Ending balance, net of income tax	39,568	15,375	12,481
Unrealized Loss on Marketable Security
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance, net of income tax		(2,758)
Other comprehensive income (loss), Pretax amount		4,398
Other comprehensive income (loss), Income tax effect, net of adoption of ASU 2018-02		(1,640)
Total other comprehensive income (loss), Change, net of income tax and ASU 2018-02		2,758
Ending balance, net of income tax			(2,758)
Minimum Pension Liability
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance, net of income tax	(14,113)	(6,754)
Other comprehensive income (loss), Pretax amount	8,503	(6,892)
Other comprehensive income (loss), Income tax effect	(2,048)
Total other comprehensive income (loss), net of tax	6,455
Other comprehensive income (loss), Income tax effect, net of adoption of ASU 2018-02		(467)
Total other comprehensive income (loss), Change, net of income tax and ASU 2018-02		(7,359)
Ending balance, net of income tax	(7,658)	(14,113)	(6,754)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance, net of income tax	4,242	7,177
Ending balance, net of income tax	$ 31,893	$ 4,242	$ 7,177