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Revenue and Related Contract Costs and Contract Liabilities - Balance Sheet Reclassifications made to Separately Present Contract Costs and Contract Liabilities in Connection with Adoption of Topic 606 (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  | $ 42,340 | $ 53,723 |  | $ 25,434 | $ 20,900
Accounts receivable, net |  | 118,284 | 104,811 |  |  |
Inventories |  | 17,514 | 17,550 | [1] |  |
Current contract costs |  | 22,620 | 13,436 | [1] |  |
Other current assets |  | 23,077 | 19,741 | [1] |  |
Property and equipment, net |  | 316,879 | 305,571 |  |  |
Other investments and assets |  | 48,789 | 48,187 | [1] |  |
Deferred income taxes |  | 28,055 | 23,548 |  |  |
Goodwill |  | 269,794 | 270,551 |  |  |
Other intangible assets, net |  | 60,795 | 62,781 |  |  |
Total Assets |  | 948,147 | 919,899 |  |  |
Accounts payable |  | 82,019 | 77,380 |  |  |
Contract liabilities |  | 51,891 | 31,981 | [2] |  |
Accrued compensation |  | 18,734 | 30,614 |  |  |
Other current liabilities |  | 50,817 | 40,154 | [2] |  |
Debt and capital lease obligations, current and long-term |  | 231,318 | 209,192 |  |  |
Pension and postretirement benefits |  | 28,153 | 28,135 |  |  |
Other deferred items and liabilities |  | 48,786 | 52,858 |  |  |
Total liabilities |  | 511,718 | 470,314 |  |  |
Redeemable noncontrolling interest |  | 6,950 | 6,648 |  |  |
Total stockholders' equity |  | 429,479 | 442,937 | [3] | $ 378,036 | $ 370,638
Total Liabilities and Stockholders’ Equity |  | $ 948,147 | 919,899 |  |  |
Accounting Standards Update 2014-09 | As Previously Reported |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  |  | 53,723 |  |  |
Accounts receivable, net |  |  | 104,811 |  |  |
Inventories | [1] |  | 30,372 |  |  |
Other current assets | [1] |  | 21,030 |  |  |
Property and equipment, net |  |  | 305,571 |  |  |
Other investments and assets | [1] |  | 47,512 |  |  |
Deferred income taxes |  |  | 23,548 |  |  |
Goodwill |  |  | 270,551 |  |  |
Other intangible assets, net |  |  | 62,781 |  |  |
Total Assets |  |  | 919,899 |  |  |
Accounts payable |  |  | 77,380 |  |  |
Customer deposits | [2] |  | 33,415 |  |  |
Accrued compensation |  |  | 30,614 |  |  |
Other current liabilities | [2] |  | 38,720 |  |  |
Debt and capital lease obligations, current and long-term |  |  | 209,192 |  |  |
Pension and postretirement benefits |  |  | 28,135 |  |  |
Other deferred items and liabilities |  |  | 52,858 |  |  |
Total liabilities |  |  | 470,314 |  |  |
Redeemable noncontrolling interest |  |  | 6,648 |  |  |
Total stockholders' equity | [3] |  | 442,937 |  |  |
Total Liabilities and Stockholders’ Equity |  |  | 919,899 |  |  |
Accounting Standards Update 2014-09 | Effect of Change |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |
Inventories | [1] |  | (12,822) |  |  |
Current contract costs | [1] |  | 13,436 |  |  |
Other current assets | [1] |  | (1,289) |  |  |
Other investments and assets | [1] |  | 675 |  |  |
Customer deposits | [2] |  | (33,415) |  |  |
Contract liabilities | [2] |  | 31,981 |  |  |
Other current liabilities | [2] |  | $ 1,434 |  |  |
[1] | Contract costs primarily consist of deferred core services costs (including labor and vendor purchases) required to service future exhibitions, conferences and other events, and commission expenses incurred to obtain contracts. All such costs were previously included in “Inventories” and in other certain assets. As a result of the changes noted above, deferred core services costs related to exhibitions and events that are scheduled to occur longer than one year in the future are currently included in “Other investments and assets”. The impact of this change reduced total current assets at December 31, 2017 by $0.7 million. The amount of deferred core services costs included in “Other investments and assets” at March 31, 2018 was $4.6 million.
[2] | In connection with the adoption of Topic 606, we elected to more prominently present contract liabilities on the Consolidated Balance Sheets. Consequently, customer deposits of $33.4 million as of December 31, 2017, have been reclassified to “Contract liabilities” and to other certain current liabilities to conform to the current period presentation.
[3] | The cumulative effect of initially applying Topic 606 as an adjustment to the opening balance of retained earnings was determined to be immaterial and therefore no adjustment was made.

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