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Supplemental Information to Consolidated Statements of Cash Flows - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2017 | Feb. 28, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
4.25% Convertible Senior Notes (due 2018) |  |  |  |  |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |  |  |  |  |
Debt instrument shares common stock issued upon conversion (in shares) |  |  |  | 2,900,000 |  |  |
Common Stock |  |  |  |  |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |  |  |  |  |
Restricted stock surrendered, (in shares) |  |  |  |  |  | 9,000 | 25,000
Common Stock | 4.25% Convertible Senior Notes (due 2018) |  |  |  |  |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |  |  |  |  |
Debt instrument shares common stock issued upon conversion (in shares) | 112,400 | 2,865,000 | 112,400 |  |  | 3,000,000 |
Common stock shares issued upon conversion of debt instrument, value | $ 0.4 | $ 15.1 |  |  |  | $ 15.5 |
Restricted Stock |  |  |  |  |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |  |  |  |  |
Restricted stock surrendered, (in shares) |  |  |  |  | 42,346 | 29,689 | 50,719
Restricted stock surrendered, in values |  |  |  |  | $ 0.1 | $ 0.1 | $ 1.5
Tax benefit (deficiency) related to restricted stock compensation |  |  |  |  |  |  | $ 0.5
Employees - including an executive officer |  |  |  |  |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |  |  |  |  |
Restricted stock surrendered, (in shares) |  |  |  |  | 42,346 | 29,689 | 50,719
Restricted stock surrendered, in values |  |  |  |  |  |  | $ 1.5
Employees - including an executive officer | Maximum |  |  |  |  |  |  |
Cash Flow Supplemental Disclosures [Line Items] |  |  |  |  |  |  |
Restricted stock surrendered, in values |  |  |  |  | $ 0.0 | $ 0.1 |

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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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