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Derivative Instruments - Schedule of Derivative Instruments Classified as Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
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Mar. 31, 2014
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Mar. 31, 2013
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Dec. 31, 2013
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| Derivatives, Fair Value [Line Items] | |||
| Fair Market Value, Current Portion | $ 11,906 | $ 13,937 | |
| Fair Market Value, Current Portion | (16,205) | (16,171) | |
| Fair Market Value, Long-Term Portion | 66,935 | 82,167 | |
| Fair Market Value, Long-Term Portion | (7,520) | (7,439) | |
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Undesignated Derivative Instruments [Member] | Derivative Assets (Liabilities) [Member]
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| Derivatives, Fair Value [Line Items] | |||
| Fair Market Value, Current Portion | 7,990 | 13,543 | 10,038 |
| Fair Market Value, Long-Term Portion | 60,047 | 59,771 | 69,455 |
| QTD Gain (loss) Recognized into Income | (11,456) | (6,758) | (1,358) |
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Undesignated Derivative Instruments [Member] | Interest rate swaps [Member] | Derivative Assets (Liabilities) [Member]
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| Derivatives, Fair Value [Line Items] | |||
| Quantity | 6 | 6 | 6 |
| Maturity Dates | Jun. 30, 2030 | Jun. 30, 2030 | Jun. 30, 2030 |
| Fair Market Value, Current Portion | (3,916) | (2,894) | (3,899) |
| Fair Market Value, Long-Term Portion | 10,826 | (129) | 14,358 |
| QTD Gain (loss) Recognized into Income | (3,549) | 1,886 | 4,585 |
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Undesignated Derivative Instruments [Member] | Interest rate cap [Member] | Derivative Assets (Liabilities) [Member]
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| Derivatives, Fair Value [Line Items] | |||
| Quantity | 1 | 1 | 1 |
| Maturity Dates | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 |
| Fair Market Value, Current Portion | |||
| Fair Market Value, Long-Term Portion | 507 | 492 | 681 |
| QTD Gain (loss) Recognized into Income | (174) | 45 | 107 |
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Undesignated Derivative Instruments [Member] | Energy derivative [Member] | Derivative Assets (Liabilities) [Member]
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| Derivatives, Fair Value [Line Items] | |||
| Quantity | 1 | 1 | 1 |
| Maturity Dates | Apr. 30, 2019 | Apr. 30, 2019 | Apr. 30, 2019 |
| Fair Market Value, Current Portion | 11,906 | 13,543 | 13,937 |
| Fair Market Value, Long-Term Portion | 48,714 | 59,279 | 54,416 |
| QTD Gain (loss) Recognized into Income | (7,733) | (6,803) | (6,050) |
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Designated Derivative Instruments [Member] | Derivative Assets (Liabilities) [Member]
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| Derivatives, Fair Value [Line Items] | |||
| Fair Market Value, Current Portion | (12,289) | (12,008) | (12,272) |
| Fair Market Value, Long-Term Portion | (632) | (26,550) | 5,273 |
| QTD Gain (loss) Recognized in OCI | (5,922) | 5,320 | 9,389 |
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Designated Derivative Instruments [Member] | Interest rate swaps [Member] | Derivative Assets (Liabilities) [Member] | Maturity Date, 6/30/2033 [Member]
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| Derivatives, Fair Value [Line Items] | |||
| Quantity | 6 | 6 | 6 |
| Maturity Dates | Jun. 30, 2033 | Jun. 30, 2033 | Jun. 30, 2033 |
| Fair Market Value, Current Portion | (2,126) | (1,547) | (2,105) |
| Fair Market Value, Long-Term Portion | 6,888 | 29 | 9,625 |
| QTD Gain (loss) Recognized in OCI | (2,758) | 1,396 | 3,117 |
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Designated Derivative Instruments [Member] | Interest rate swaps [Member] | Derivative Assets (Liabilities) [Member] | Maturity Date, 3/15/2020 [Member]
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| Derivatives, Fair Value [Line Items] | |||
| Quantity | 7 | 7 | 7 |
| Maturity Dates | Mar. 15, 2020 | Mar. 15, 2020 | Mar. 15, 2020 |
| Fair Market Value, Current Portion | (5,250) | (5,502) | (5,289) |
| Fair Market Value, Long-Term Portion | (7,452) | (15,352) | (7,439) |
| QTD Gain (loss) Recognized in OCI | 26 | 1,272 | 2,129 |
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Designated Derivative Instruments [Member] | Interest rate swaps [Member] | Derivative Assets (Liabilities) [Member] | Maturity Date, 6/28/2030 [Member]
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| Derivatives, Fair Value [Line Items] | |||
| Quantity | 2 | 2 | 2 |
| Maturity Dates | Jun. 28, 2030 | Jun. 28, 2030 | Jun. 28, 2030 |
| Fair Market Value, Current Portion | (4,913) | (4,959) | (4,878) |
| Fair Market Value, Long-Term Portion | (68) | (11,227) | 3,087 |
| QTD Gain (loss) Recognized in OCI | $ (3,190) | $ 2,652 | $ 4,143 |