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Summary of Significant Accounting Policies - Significant Estimates Used by Management in Determining Fair Values of Company's Reporting Units (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Line Items] |  |  |
Years of cash flows before terminal value | 5 years | 5 years | 5 years
Discounted cash flows | 70.00% | 70.00% | 70.00%
Market multiple | 15.00% | 15.00% | 15.00%
Market capitalization | 15.00% | 15.00% | 15.00%
Minimum |  |  |
Goodwill [Line Items] |  |  |
Discount rates | 12.00% | 12.50% | 12.00%
EBITDA multiples | 5.5 | 5.5 | 5.0
Maximum |  |  |
Goodwill [Line Items] |  |  |
Discount rates | 14.00% | 14.50% | 16.00%
EBITDA multiples | 7.0 | 7.0 | 6.5

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- Definition Goodwill Impairment Testing Assumptions [Line Items] + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Market valuation of entity divided by earnings before interest, taxes, depreciation, and amortization (EBITDA), used as an input to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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