Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income including noncontrolling interest	$ 218,407us-gaap_ProfitLoss	$ 207,160us-gaap_ProfitLoss	$ 201,351us-gaap_ProfitLoss
Adjustments to reconcile net income including noncontrolling interest to net cash provided by operating activities:
Depreciation and amortization	59,399us-gaap_DepreciationAndAmortization	44,710us-gaap_DepreciationAndAmortization	36,714us-gaap_DepreciationAndAmortization
Provision for bad debt	3,757us-gaap_ProvisionForDoubtfulAccounts	11,745us-gaap_ProvisionForDoubtfulAccounts	4,790us-gaap_ProvisionForDoubtfulAccounts
Gain on sale of crude oil joint venture interests	(18,082)int_GainOnSaleOfJointVentureInterest
Share-based payment award compensation costs	15,755us-gaap_ShareBasedCompensation	16,716us-gaap_ShareBasedCompensation	14,079us-gaap_ShareBasedCompensation
Deferred tax provision (benefit)	10,351us-gaap_DeferredIncomeTaxExpenseBenefit	(8,243)us-gaap_DeferredIncomeTaxExpenseBenefit	9,665us-gaap_DeferredIncomeTaxExpenseBenefit
Extinguishment of liabilities	(5,250)	(8,538)	(11,199)
Other	(12,322)us-gaap_OtherNoncashIncomeExpense	2,065us-gaap_OtherNoncashIncomeExpense	(5,659)us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities, net of acquisitions:
Accounts receivable, net	462,517	(328,969)	97,297
Inventories	232,258us-gaap_IncreaseDecreaseInInventories	(77,754)us-gaap_IncreaseDecreaseInInventories	(90,847)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses	46,479	30,755	(51,155)
Short-term derivative assets, net	(265,779)	3,534	2,577
Other current assets	(30,200)	(22,591)	(3,517)
Cash collateral with financial counterparties	(288,049)	9,920	(11,059)
Other non-current assets	2,877	(19,638)	4,793
Accounts payable	(585,674)	385,482	(45,179)
Customer deposits	12,816	13,874	(6,513)
Accrued expenses and other current liabilities	266,534	(3,549)	1,795
Non-current income tax, net and other long-term liabilities	15,366	7,623	(2,142)
Total adjustments	(77,247)	57,142	(55,560)
Net cash provided by operating activities	141,160	264,302	145,791
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired and other investments	(273,649)	(76,954)	(217,782)
Capital expenditures	(50,153)	(82,716)	(28,454)
Escrow payment related to an assumed obligation of an acquired business	(21,724)
Proceeds from the sale of crude oil joint venture interests	43,000
Purchase of investments	(2,104)us-gaap_PaymentsToAcquireInvestments	(21,588)us-gaap_PaymentsToAcquireInvestments
Proceeds from the sale of short-term investments		21,588
Issuances of notes receivable		(7,969)	(787)
Repayment of notes receivable	7,543		401
Decrease in cash due to deconsolidation of crude oil transloading joint venture		(6,921)us-gaap_CashDivestedFromDeconsolidation
Net cash used in investing activities	(297,087)	(174,560)	(246,622)
Cash flows from financing activities:
Borrowings of debt	5,757,254us-gaap_ProceedsFromIssuanceOfDebt	4,556,618us-gaap_ProceedsFromIssuanceOfDebt	4,050,500us-gaap_ProceedsFromIssuanceOfDebt
Repayments of debt	(5,551,509)us-gaap_RepaymentsOfDebt	(4,476,304)us-gaap_RepaymentsOfDebt	(3,965,960)us-gaap_RepaymentsOfDebt
Dividends paid on common stock	(10,595)us-gaap_PaymentsOfDividendsCommonStock	(10,679)us-gaap_PaymentsOfDividendsCommonStock	(10,685)us-gaap_PaymentsOfDividendsCommonStock
Investment by noncontrolling interest		17,519
Distribution of noncontrolling interest	(11,581)	(15,489)	(1,401)
Purchases of common stock	(9,999)	(35,000)
Federal and state tax benefits resulting from tax deductions in excess of the compensation cost recognized for share-based payment awards	1,028	3,301	3,681
Purchases of common stock tendered by employees to satisfy the required withholding taxes related to share-based payment awards	(5,083)	(6,768)	(4,973)
Other payments		(3,689)	(4,304)
Net cash provided by financing activities	169,515	29,509	66,858
Effect of exchange rate changes on cash and cash equivalents	(3,385)	70	1,298
Net increase (decrease) in cash and cash equivalents	10,203	119,321	(32,675)
Cash and cash equivalents, as of beginning of period	292,061	172,740	205,415
Cash and cash equivalents, as of end of period	302,264	292,061	172,740
Supplemental Disclosures of Cash Flow Information Cash paid during the year for:
Interest, net of capitalized interest	29,151us-gaap_InterestPaidNet	19,131us-gaap_InterestPaidNet	17,227us-gaap_InterestPaidNet
Income taxes	$ 40,785us-gaap_IncomeTaxesPaidNet	$ 34,557us-gaap_IncomeTaxesPaidNet	$ 26,529us-gaap_IncomeTaxesPaidNet

The noncash gain resulting from the sale of joint venture partner's interests.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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The cash outflow to reacquire common stock during the period.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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The cash outflow to acquire an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among myriad other features and characteristics.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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No definition available.

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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No definition available.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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