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Shareholders' equity - Narrative (Detail) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 01, 2018 shares | May 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | May 04, 2010 shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Common stock, authorized (in shares) |  |  |  | 800,000,000 | 800,000,000 |  |
Preferred stock, authorized (in shares) |  |  |  | 2,000,000 | 2,000,000 |  |
Common stock, outstanding (in shares) |  |  |  | 217,500,000 | 215,800,000 |  |
Treasury stock (in shares) |  |  |  | 106,955,082 | 108,660,002 |  |
Preferred stock, issued (in shares) |  |  |  | 0 | 0 |  |
Preferred stock, outstanding (in shares) |  |  |  | 0 | 0 |  |
Shares approved to be repurchased under share repurchase program, amount | $ |  |  | $ 300,000,000.0 |  |  |  |
Share repurchase program, period in force |  |  | 3 years |  |  |  |
Shares repurchased under share repurchase program (in shares) |  |  |  | 0 | 500,000 | 1,500,000 |
Cost of common shares repurchased | $ |  |  |  | $ 0 | $ 5,831,000 | $ 23,480,000 |
Remaining authorized repurchase amount | $ |  |  |  | $ 279,100,000 |  |  |
Shares granted with aggregate target awards (in shares) | 600,000 |  |  |  |  |  |
Spin-off of Cars.com | $ |  |  |  |  |  | $ 1,513,881,000 |
Minimum |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Number of units ultimately paid for performance share awards of target (as a percent) |  |  |  | 0 |  |  |
Maximum |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Number of units ultimately paid for performance share awards of target (as a percent) |  |  |  | 2 |  |  |
Stock Options | Employee |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Shares reserved for issuance (in shares) |  |  |  |  |  |  | 60,000,000.0
Performance Based Awards |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  | 3 years |  |  |
Restricted Stock Units (RSUs) | Employee |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Number of shares of common stock received for each RSU granted |  |  |  | 1 |  |  |
Award vesting percentage |  |  |  | 25.00% |  |  |
Performance Shares |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost related to non-vested share-based compensation | $ |  |  |  | $ 0 |  |  |
Spin-off adjustment, conversion factor |  |  |  | 1.59 |  | 1.59 |
Restricted Stock and Restricted Stock Units |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Unrecognized compensation cost related to non-vested share-based compensation | $ |  |  |  | $ 19,400,000 |  |  |
Unrecognized compensation cost related to non-vested share-based compensation for options, recognition period |  |  |  | 2 years 7 months 6 days |  |  |
Retained earnings |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Spin-off of Cars.com | $ |  |  |  |  |  | $ 1,513,881,000 |
Retained earnings | Cars.com |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Spin-off of Cars.com | $ |  | $ 1,500,000,000 |  |  |  |  |
Cars.com | Performance Shares |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Adjustment due to spin-off of Publishing (in shares) |  |  |  | 0 | 0 | 178,775 |
Cars.com | Restricted Stock and Restricted Stock Units |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Adjustment due to spin-off of Publishing (in shares) |  |  |  | 0 | 0 | 606,377 |

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