Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
U.S. federal tax rate		35.00%	35.00%	35.00%
Overall Spanish tax settlement				$ 10,500
Reversals of liabilities for uncertain tax positions	$ 9,500	$ 9,500	$ 7,500	2,800
Tax reform, toll charge	100,600
Tax reform, remeasurement	38,600
Deferred tax assets realized	60,300	60,300
Tax reform, benefit recorded		9,200
Valuation allowance	207,483	207,483	152,752
Share-based compensation, excess tax benefit, amount		3,300	5,300
Operating loss carryforwards	218,933	218,933	186,062
Deferred tax asset	225,000	225,000
Valuation allowance for net operating loss carryforwards	198,100	198,100
Tax credits established against deferred tax assets	8,600	8,600
Valuation allowance established against certain other net deferred tax assets	3,200	3,200
Reduction in accrual for interest and penalties	3,000	3,000	300	1,400
Accrued interest and penalties	2,800	2,800	800	800
Tax benefits credited to Shareholders' equity		100	200
Provision for uncertain tax positions	42,300	42,300
Tax reform, undistributed accumulated foreign earnings	1,900,000	1,900,000
Tax reform, deferred tax liability from undistributed foreign earnings	72,000	72,000
Other liabilities [Member]
Income Taxes [Line Items]
Unrecognized tax benefits that would impact effective tax rate	28,500	28,500	19,100	24,200
Other Current Liabilities [Member]
Income Taxes [Line Items]
Unrecognized tax benefits that would impact effective tax rate	9,700	9,700		7,300
2018 to 2037 [Member]
Income Taxes [Line Items]
Operating loss carryforwards	212,500	212,500	149,100
Deferred tax assets, operating loss carryforwards, subject to expiration			6,600
Tax credit carryforwards	12,500	12,500	$ 42,800
Tax credits established against deferred tax assets	12,200	12,200
Indefinite [Member]
Income Taxes [Line Items]
Operating loss carryforwards	205,900	205,900
Tax credit carryforwards	300	300
Other Liabilities [Member]
Income Taxes [Line Items]
Accrued interest and penalties	1,300	1,300		$ 300
State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Valuation allowance	$ 11,000	$ 11,000