Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Income Tax Reconciliation from Federal Income Tax Statutory Rate (Detail)

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Income Taxes - Schedule of Income Tax Reconciliation from Federal Income Tax Statutory Rate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Computed expected tax expense $ (38,381) $ (54,825) $ (25,190)
Foreign taxes 13,084 12,688 16,043
Tax effect different from statutory rates (2,048) (3,629) (2,729)
State taxes, net of federal benefit 35 (849) (4,544)
Foreign tax credits 3 20 (5,566)
Change in valuation allowance (excluding impact of Tax Act) 30,704 117,707 40,676
Uncertain tax positions 194 (726) (81)
Permanent differences 2,970 1,442 1,696
Prior year return to provision adjustments 2,442 2,078 1,555
Other 37 264 453
Impact of Tax Act      
Effect of tax rate reduction on deferred tax 45,329 0 0
Effect of tax rate on deferred tax valuation (45,329) 0 0
Total income tax expense (benefit) $ 9,040 $ 74,170 $ 22,313
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Computed expected tax expense 35.00% 35.00% 35.00%
Foreign taxes (11.90%) (8.10%) (22.30%)
Tax effect different from statutory rates 1.90% 2.30% 3.80%
State taxes, net of federal benefit 0.00% 0.50% 6.30%
Foreign tax credits (0.00%) (0.00%) 7.70%
Change in valuation allowance (excluding impact of Tax Act) (28.00%) (75.10%) (56.50%)
Uncertain tax positions (0.20%) 0.50% 0.10%
Permanent differences (2.70%) (0.90%) (2.40%)
Prior year return to provision adjustments (2.30%) (1.30%) (2.10%)
Other 0.00% (0.20%) (0.60%)
Effect Of Tax Cuts And Jobs Act Of 2017, Percent [Abstract]      
Effect of tax rate reduction on deferred tax (41.30%) 0.00% 0.00%
Effect of tax rate on deferred tax valuation 41.30% 0.00% 0.00%
Actual Tax Expense, Percentage (8.20%) (47.30%) (31.00%)