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Fair Value Measurements - Fair Value Hierarchy Table for Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading securities held in the deferred compensation plans | $ 62,009 | $ 57,293
Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading securities held in the deferred compensation plans | 62,009 | 57,293
Level 2 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading securities held in the deferred compensation plans | 0 | 0
Fair Value, Inputs, Level 3 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading securities held in the deferred compensation plans | 0 | 0
Swaps | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 131,886 | 69,156
Swaps | Freight | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 1,529 | (561)
Swaps | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 0 | 0
Swaps | Fair Value, Inputs, Level 1 | Freight | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 0 | 0
Swaps | Level 2 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 131,886 | 69,156
Swaps | Level 2 | Freight |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 1,500 |
Swaps | Level 2 | Freight | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 1,529 | (561)
Swaps | Fair Value, Inputs, Level 3 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 0 | 0
Swaps | Fair Value, Inputs, Level 3 | Freight | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 0 | 0
Calls | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | (349) |
Calls | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 0 |
Calls | Level 2 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | (349) |
Calls | Fair Value, Inputs, Level 3 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 0 |
Collars | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net |  | 14,483
Collars | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net |  | 0
Collars | Level 2 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net |  | 5,945
Collars | Fair Value, Inputs, Level 3 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net |  | 8,538
Basis Swaps | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | (4,732) | 4,883
Basis Swaps | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 0 | 0
Basis Swaps | Level 2 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | (4,732) | 4,883
Basis Swaps | Fair Value, Inputs, Level 3 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 0 | 0
Swaptions | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | (4,848) | (2,772)
Swaptions | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 0 | 0
Swaptions | Level 2 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | 0 | 0
Swaptions | Fair Value, Inputs, Level 3 | Fair Value, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets liabilities at fair value net | $ (4,848) | $ (2,772)

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