Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Net deferred tax asset and offsetting valuation allowance for swiss tax reform		$ 74,200
Net tax benefit related to tax law change	$ 14,200	23,267	$ 49,175	$ 623
Charge relating to previously deferred earnings of certain non-US subsidiaries		7,209
Revised net tax benefit associated with tax reform act	34,500
Unrecorded tax liability		95,000
Net operating loss carryforwards, or NOLs		253,973	209,679
Deferred tax asset relates to NOL carryforwards		154,700
Net operating loss carryforwards to expire		$ 99,300
Net operating loss carryforwards expiring years		2021 and 2038
Deferred tax assets for foreign tax credits		$ 43,026	43,225
Valuation allowance of net operating losses		186,600
Net liability for uncertain tax positions		118,884	55,943	81,864	$ 34,970
Net increase in uncertain tax positions from prior years		2,113	20,943	2,938
Addition to current year tax positions		85,970	2,906	51,260
Net unrecognized tax benefits that would affect the effective tax rate		148,800	81,600	101,900
Accrued interest on uncertain tax positions		4,000	3,200
Accrued penalties on uncertain tax positions		16,500	16,300
Interest expense recognized related to uncertain tax positions		1,000	100	500
Penalties recognized related to uncertain tax positions		300	600	(1,700)
Tax Year 2013 [Member]
Income Tax Contingency [Line Items]
Decrease in unrecognized tax benefit		5,100
Other Assets [Member]
Income Tax Contingency [Line Items]
Net liability for uncertain tax positions		500	1,200
Deferred Tax Liability [Member]
Income Tax Contingency [Line Items]
Net liability for uncertain tax positions		91,100	7,500
Other Liabilities [Member]
Income Tax Contingency [Line Items]
Net liability for uncertain tax positions		58,300	75,300
Retained Earnings [Member]
Income Tax Contingency [Line Items]
Valuation allowance reduced		6,200
Deferred Tax Assets Including Net Operating Losses, Foreign Tax Credits and Other [Member]
Income Tax Contingency [Line Items]
Change in valuation allowance		30,700	35,200	37,900
Releases of Valuation Allowances in Various Jurisdictions [Member]
Income Tax Contingency [Line Items]
Change in valuation allowance		19,000	$ 23,300	$ 79,400
United States [Member]
Income Tax Contingency [Line Items]
Deferred tax assets for foreign tax credits		43,000
Diamond Foreign Assets Corporation [Member]
Income Tax Contingency [Line Items]
Withholding income tax		400
U.S. Federal [Member]
Income Tax Contingency [Line Items]
Tax credit resulting from remeasurement of net U.S. deferred tax liabilities	72,500
Net operating loss carryforwards, or NOLs		149,400
Foreign [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards, or NOLs		104,600
Switzerland Tax Legislation [Member]
Income Tax Contingency [Line Items]
Net liability for uncertain tax positions		$ 86,200
Mandatory Repatriation [Member] | U.S. Federal [Member]
Income Tax Contingency [Line Items]
Charge relating to previously deferred earnings of certain non-US subsidiaries	$ 38,000
Foreign Tax Credit Carryforwards [Member] | United States [Member]
Income Tax Contingency [Line Items]
Foreign tax credits expiration periods		between 2020 to 2030