Summary of Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2013
Basis of Presentation, Policy	The condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. As a result, certain information and note disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP) have been condensed or omitted. The Company believes that the disclosures made are adequate to make the information presented not misleading. The condensed consolidated financial statements reflect all adjustments, consisting of normal recurring items, which are, in the opinion of management, necessary to a fair statement of the results for the interim periods presented. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company's Form 10-K as filed with the Securities and Exchange Commission on February 27, 2013. All significant intercompany accounts and transactions have been eliminated in consolidation. All dollar amounts in the notes are presented in thousands except for share data. Certain prior year amounts have been reclassified to conform to the 2013 presentation.
Accounts Receivable, Policy	The Company maintains an allowance for doubtful accounts, which is reviewed at least monthly for estimated losses resulting from the inability of its customers to make required payments for services and advances. Additional allowances may be necessary in the future if the ability of its customers to pay deteriorates. The Company has recorded an allowance for doubtful accounts in the amounts of $10,187 as of September 30, 2013 and $9,383 as of December 31, 2012. Additions and write-offs have not been significant in the periods presented.
Use of Estimates, Policy	The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of the assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the period. The Company uses estimates primarily in the following areas: accounts receivable valuation, accrual of costs related to ancillary services the Company provides, accrual of insurance liabilities for the portion of the freight related exposure which the Company has self-insured, accrual of various tax liabilities, accrual of loss contingencies and calculation of share-based compensation expense. Actual results could differ from those estimates.
Stock Plans, Policy	The Company recognizes stock compensation expense based on an estimate of the fair value of awards granted to employees and directors under the Company’s stock option, director restricted stock and employee stock purchase rights plans. The expense, adjusted for expected forfeitures, is recognized on a straight-line basis over the stock awards' vesting period. The forfeiture assumption used to calculate compensation expense is primarily based on historical pre-vesting employee forfeiture patterns.
Cash and Cash Equivalents, Policy	Cash equivalents consist of highly liquid investments with a maturity of three months or less at date of purchase.
Short-term Investments, Policy	Short-term investments have a maturity of greater than three months at date of purchase.
Segment Reporting, Policy	The Company is organized functionally in geographic operating segments. Accordingly, management focuses its attention on revenues, net revenues¹, operating income, identifiable assets, capital expenditures, depreciation and amortization and equity generated in each of these geographical areas when evaluating the effectiveness of geographic management. The Company charges its subsidiaries and affiliates for services rendered in the United States on a cost recovery basis. Transactions among the Company’s various offices are conducted using the same arms-length pricing methodologies the Company uses when its offices transact business with independent agents.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2013

The condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. As a result, certain information and note disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States (U.S. GAAP) have been condensed or omitted. The Company believes that the disclosures made are adequate to make the information presented not misleading. The condensed consolidated financial statements reflect all adjustments, consisting of normal recurring items, which are, in the opinion of management, necessary to a fair statement of the results for the interim periods presented. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company's Form 10-K as filed with the Securities and Exchange Commission on February 27, 2013.

All significant intercompany accounts and transactions have been eliminated in consolidation. All dollar amounts in the notes are presented in thousands except for share data. Certain prior year amounts have been reclassified to conform to the 2013 presentation.

Accounts Receivable, Policy

The Company maintains an allowance for doubtful accounts, which is reviewed at least monthly for estimated losses resulting from the inability of its customers to make required payments for services and advances. Additional allowances may be necessary in the future if the ability of its customers to pay deteriorates. The Company has recorded an allowance for doubtful accounts in the amounts of $10,187 as of September 30, 2013 and $9,383 as of December 31, 2012. Additions and write-offs have not been significant in the periods presented.

Use of Estimates, Policy

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of the assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the period. The Company uses estimates primarily in the following areas: accounts receivable valuation, accrual of costs related to ancillary services the Company provides, accrual of insurance liabilities for the portion of the freight related exposure which the Company has self-insured, accrual of various tax liabilities, accrual of loss contingencies and calculation of share-based compensation expense. Actual results could differ from those estimates.

Stock Plans, Policy

The Company recognizes stock compensation expense based on an estimate of the fair value of awards granted to employees and directors under the Company’s stock option, director restricted stock and employee stock purchase rights plans. The expense, adjusted for expected forfeitures, is recognized on a straight-line basis over the stock awards' vesting period. The forfeiture assumption used to calculate compensation expense is primarily based on historical pre-vesting employee forfeiture patterns.

Cash and Cash Equivalents, Policy

Cash equivalents consist of highly liquid investments with a maturity of three months or less at date of purchase.

Short-term Investments, Policy

Short-term investments have a maturity of greater than three months at date of purchase.

Segment Reporting, Policy

The Company is organized functionally in geographic operating segments. Accordingly, management focuses its attention on revenues, net revenues¹, operating income, identifiable assets, capital expenditures, depreciation and amortization and equity generated in each of these geographical areas when evaluating the effectiveness of geographic management. The Company charges its subsidiaries and affiliates for services rendered in the United States on a cost recovery basis. Transactions among the Company’s various offices are conducted using the same arms-length pricing methodologies the Company uses when its offices transact business with independent agents.

- Definition

Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.

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- Definition

Disclosure of accounting policy for investments in debt and equity securities that have readily determinable fair values (marketable securities). At a minimum, the disclosure might address accounting policies for investments classified as trading, available for sale, or held to maturity and may include how the entity determines whether impairments of available for sale or held to maturity investments are other than temporary, how the fair values of the entity's securities are determined, and the entity's accounting treatment for transfers between investment categories.

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- Definition

Disclosure of accounting policy for trade and other accounts receivable, and finance, loan and lease receivables, including those classified as held for investment and held for sale. This disclosure may include (1) the basis at which such receivables are carried in the entity's statements of financial position (2) how the level of the valuation allowance for receivables is determined (3) when impairments, charge-offs or recoveries are recognized for such receivables (4) the treatment of origination fees and costs, including the amortization method for net deferred fees or costs (5) the treatment of any premiums or discounts or unearned income (6) the entity's income recognition policies for such receivables, including those that are impaired, past due or placed on nonaccrual status and (7) the treatment of foreclosures or repossessions (8) the nature and amount of any guarantees to repurchase receivables.

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