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Basis of Presentation and Summary of Significant Accounting Policies - Concentration of Risk (Detail) | 12 Months Ended
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Dec. 31, 2017 Client Supplier | Dec. 31, 2016 Client Supplier | Dec. 31, 2015 Client
Gross Billings |  |  |
Concentration Risk [Line Items] |  |  |
Number of client | 3 | 3 | 2
Gross Billings | Customer One |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 22.00% | 15.00% | 12.00%
Gross Billings | Customer Two |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 11.00% | 13.00% | 12.00%
Gross Billings | Customer Three |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 10.00% | 11.00% |
Consolidated Accounts Receivable |  |  |
Concentration Risk [Line Items] |  |  |
Number of client | 3 | 3 |
Consolidated Accounts Receivable | Customer One |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 33.00% | 27.00% |
Consolidated Accounts Receivable | Customer Two |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 14.00% | 13.00% |
Consolidated Accounts Receivable | Customer Three |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 11.00% | 12.00% |
Trade Accounts Payables | Supplier Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 12.00% | 10.00% |
Number of supplier | Supplier | 1 | 1 |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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