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Revenue Recognition - Unbilled Receivables (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016 | Dec. 31, 2016
Roll forward of the unbilled receivables allowance |  |  |  |  |
Balance at beginning of period |  |  | $ 1,720 | $ 2,354 | $ 2,354
Increases to reserves |  |  | 1,727 |  | 2,102
Amounts written off |  |  | (914) |  | (2,736)
Effects of foreign currency translation |  |  | (2) |  |
Balance at end of period | $ 2,531 |  | 2,531 |  | 1,720
Bad debt expense |  |  | 2,852 |  | 2,156
Reimbursable expenses | $ 9,675 | $ 8,969 | $ 29,463 | $ 25,510 |
Selling, general and administrative expenses |  |  |  |  |
Roll forward of the unbilled receivables allowance |  |  |  |  |
Bad debt expense |  |  |  |  | $ 1,100

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- Definition Represents the valuation allowance for unbilled service receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References No definition available. + Details
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- Definition Amounts of increase (decrease) as a result of the amount written off on allowance for unbilled services. + References No definition available. + Details
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- Definition Amounts of increase (decrease) as a result of the effects of foreign currency translation on allowance for unbilled services. + References No definition available. + Details
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- Definition Amounts of increase (decrease) as a result of Increases to reserve on allowance for unbilled services. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68075217&loc=SL9156395-115594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Repayment received or receivable for expenses incurred on behalf of a client or customer, other than those reimbursements received by landlords from tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=68075638&loc=d3e60722-111653 + Details
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