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Income taxes - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Tax Credit Carryforward [Line Items] |  |  |
Income tax benefit, principally related to Tax Cuts and Jobs Act |  | $ 50,400,000 |
Rate change in the company's income tax provision | $ (2,300,000) | (400,000) | $ 3,500,000
Net financial statement impact due to valuation allowance recorded against all U.S. deferred tax assets |  | 0 |
Provision for income taxes that may become payable upon distribution of earnings of certain foreign subsidiaries | 0 |  |
Unrecognized deferred income tax liability | 25,300,000 |  |
Penalties and interest accrued related to income tax liabilities | 2,600,000 | $ 2,300,000 |
Utilization of tax attributes, annual limitation | 70,600,000 |  |
Utilization of tax attributes, cumulative limitation | $ 454,900,000 |  |
Minimum |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Expected change in ownership percentage | 50.00% |  |
Netherlands |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Rate change in the company's income tax provision |  |  | (2,200,000)
UK |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Rate change in the company's income tax provision |  |  | $ 3,500,000

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- Definition Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, AMT Credit Refund, Provisional Income Tax Benefit + References No definition available. + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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