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Commitments and Contingencies - Additional Information (Details) - Subsidiaries - Threatened Litigation | 3 Months Ended
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Mar. 31, 2017 USD ($) claim
Denver Transit |
Loss Contingencies [Line Items] |
Number of claims filed (claims) | claim | 0
Denver Transit, Delivery of Train Management System |
Loss Contingencies [Line Items] |
Damages alleged | $ 0
Denver Transit, Installation of Constant Wireless Crossings |
Loss Contingencies [Line Items] |
Damages alleged | $ 29,900,000

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