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, 2018
Dec. 31, 2017
Dec. 31, 2016
Effective Income Tax Rate Reconciliation, Amount [Abstract]      
Computed expected tax expense $ (33,160) $ (38,381) $ (54,825)
Foreign taxes 7,321 13,084 12,688
Tax effect different from statutory rates (68) (2,048) (3,629)
State taxes, net of federal benefit (2,552) 35 (849)
Foreign tax credits 0 3 20
Change in valuation allowance (excluding impact of Tax Act) 28,353 30,704 117,707
Uncertain tax positions (221) 194 (726)
Permanent differences 8,008 2,970 1,442
Prior year return to provision adjustments 50 2,442 2,078
Other 65 37 264
Impact of Tax Act      
Effect of tax rate reduction on deferred tax 0 45,329 0
Effect of tax rate on deferred tax valuation 0 (45,329) 0
Total income tax expense (benefit) $ 7,796 $ 9,040 $ 74,170
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Computed expected tax expense 21.00% 35.00% 35.00%
Foreign taxes (4.60%) (11.90%) (8.10%)
Tax effect different from statutory rates 0.00% 1.90% 2.30%
State taxes, net of federal benefit 1.60% 0.00% 0.50%
Foreign tax credits 0.00% 0.00% 0.00%
Change in valuation allowance (excluding impact of Tax Act) (18.00%) (28.00%) (75.10%)
Uncertain tax positions 0.10% (0.20%) 0.50%
Permanent differences (5.10%) (2.70%) (0.90%)
Prior year return to provision adjustments 0.00% (2.30%) (1.30%)
Other 0.10% 0.00% (0.20%)
Impact of Tax Act, Percent      
Effect of tax rate reduction on deferred tax 0.00% (41.30%) 0.00%
Effect of tax rate on deferred tax valuation 0.00% 41.30% 0.00%
Actual Tax Expense, Percentage (4.90%) (8.20%) (47.30%)