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Long-Term Debt - Additional Information (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 03, 2016 USD ($) | Jun. 22, 2016 USD ($) | Dec. 19, 2013 USD ($) | Aug. 31, 2013 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 21, 2017 USD ($) | Jun. 05, 2014 USD ($) | Mar. 05, 2014 USD ($) investor | Jan. 12, 2012 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  |  |  | 2.43% | 2.43% |  |  |  |  |
Repayments of debt |  |  |  |  | $ 30,300,000 |  | $ 39,600,000 |  |  |  |
Forward Starting Interest Rate Swap Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest rate swap agreements, notional amount |  |  |  |  |  |  |  |  | $ 150,000,000 |  | $ 150,000,000.0
Interest rate on notional value (as a percent) |  |  |  |  |  |  |  |  | 2.56% |  | 1.415%
Faiveley Transport |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquired loans |  |  |  |  |  |  |  | $ 1,562,975,000 |  |  |
Senior Notes Due 2026 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 3.45% | 3.45% | 3.45% |  |  |  |
Long-term debt |  |  |  |  | $ 747,580,000 | $ 747,580,000 | $ 747,474,000 |  |  |  |
4.375% Senior Notes, due 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 4.375% | 4.375% | 4.375% |  |  |  |
Long-term debt |  |  |  |  | $ 248,438,000 | $ 248,438,000 | $ 248,310,000 |  |  |  |
2016 Refinancing Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred financing cost |  | $ 3,300,000 |  |  |  |  |  |  |  |  |
Minimum interest expense coverage ratio |  |  |  |  |  | 3.0 |  |  |  |  |
Maximum debt to EBITDA ratio |  |  |  |  |  | 3.25 |  |  |  |  |
2016 Refinancing Credit Agreement | Federal Funds Effective Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.50% |  |  |  |  |
2016 Refinancing Credit Agreement | LIBOR Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.00% |  |  |  |  |
2016 Refinancing Credit Agreement | Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.00% |  |  |  |  |
2016 Refinancing Credit Agreement | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.00% |  |  |  |  |
2016 Refinancing Credit Agreement | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.75% |  |  |  |  |
2016 Refinancing Credit Agreement | Alternative Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.75% |  |  |  |  |
2016 Refinancing Credit Agreement | Alternative Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.75% |  |  |  |  |
2016 Refinancing Credit Agreement | Alternative Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.75% |  |  |  |  |
2016 Refinancing Credit Agreement | Term Loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ticking fee |  | 0.10% |  |  |  |  |  |  |  |  |
2016 Refinancing Credit Agreement | Letter of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of credit amount outstanding |  |  |  |  | $ 40,500,000 | $ 40,500,000 |  |  |  |  |
2013 Refinancing Credit Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Deferred financing cost |  |  | $ 1,000,000 |  |  |  |  |  |  |  |
Basis spread on effective rate |  |  |  |  | 0.50% | 0.50% |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.00% |  |  |  |  |
2013 Refinancing Credit Agreement | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.00% |  |  |  |  |
2013 Refinancing Credit Agreement | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.75% |  |  |  |  |
2013 Refinancing Credit Agreement | Alternative Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 0.75% |  |  |  |  |
2013 Refinancing Credit Agreement | Alternative Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 1.75% |  |  |  |  |
Schuldschein Loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 11,415,000 | $ 11,415,000 | 98,671,000 |  |  |  |
Schuldschein Loan | Faiveley Transport |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 4.00% | 4.00% |  |  |  |  |
Long-term debt |  |  |  |  | $ 11,400,000 | $ 11,400,000 |  |  |  |  |
Acquired loans |  |  |  |  |  |  |  |  |  | $ 137,200,000 |
Number of investors | investor |  |  |  |  |  |  |  |  |  | 20 |
Repayments of debt |  |  |  |  |  | $ 125,800,000 |  |  |  |  |
Schuldschein Loan | March 2021 | Faiveley Transport |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Original maturities |  |  |  |  |  | 7 years |  |  |  |  |
Senior Notes | Senior Notes Due 2026 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issued | $ 750,000,000 |  |  |  |  |  |  |  |  |  |
Debt issuance price (as a percent) | 99.965% |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 3.45% |  |  |  |  |  |  |  |  |  |
Deferred financing cost | $ 2,600,000 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 747,580,000 | $ 747,580,000 | 747,474,000 |  |  |  |
Senior Notes | 4.375% Senior Notes, due 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  |  | $ 250,000,000 |  |  |  |  |  |  |
Debt issuance price (as a percent) |  |  |  | 99.879% |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 4.375% |  |  |  |  |  |  |
Deferred financing cost |  |  |  | $ 2,600,000 |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 248,438,000 | 248,438,000 | 248,310,000 |  |  |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 966,235,000 | 966,235,000 | $ 796,150,000 |  |  |  |
Line of Credit | 2016 Refinancing Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, amount |  | $ 1,200,000,000.0 |  |  |  |  |  |  |  |  |
Credit facility loan term, years |  | 5 years |  |  |  |  |  |  |  |  |
Line of credit facility, amount currently available |  |  |  |  | $ 583,200,000 | $ 583,200,000 |  |  |  |  |
Line of Credit | 2016 Refinancing Credit Agreement | Term Loan |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, amount |  | $ 400,000,000.0 |  |  |  |  |  |  |  |  |
Line of Credit | 2013 Refinancing Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, amount |  |  | $ 800,000,000 |  |  |  |  |  |  |  |
Credit facility loan term, years |  |  | 5 years |  |  |  |  |  |  |  |

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