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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Commitments and Contingencies [Line Items] |  |  |
Data and media costs incurred | $ 1,075,000 | $ 1,115,000 |
Capital commitment under non-cancellable data licensing agreements, Total | 24,345,000 |  |
Purchased IP and Capitalized Litigation Costs [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Intangible assets wrote off |  |  | $ 4,055,000
Minimum [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Estimated possible loss from pending litigation | 3,000,000 |  |
Maximum [Member] |  |  |
Commitments and Contingencies [Line Items] |  |  |
Estimated possible loss from pending litigation | $ 6,000,000 |  |

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