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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Changes in Fair Value Level 2 Assets of Derivative Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2013
Fair Value Disclosures [Line Items] |  |
Balance beginning of period | $ 2,884 | $ 11,651
Purchases and settlements (net) | (2,881) | (5,201)
Realized gains included in other income (expenses) | 2,881 | 5,201
Unrealized gains (losses) included in other income (expenses) | 640 | (8,127)
Balance at end of period | $ 3,524 | $ 3,524

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- Details
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- Definition Fair value measurement with observable inputs reconciliation recurring basis asset gain loss included in earnings. + References No definition available. + Details
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- Definition Fair value measurement with observable inputs reconciliations recurring basis asset purchases sales issuances settlements. + References No definition available. + Details
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- Definition Fair Value Measurement With Observable Inputs Reconciliations Recurring Basis Asset Value + References No definition available. + Details
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