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Fair Value Measurements - Reconciliation of Level 3 Liabilities (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |
Change in the estimated fair value of the contingent purchase price consideration | $ (19) | $ 5,497 | $ (132) | $ 5,327 | $ 5,047 | $ 509 | $ 170
Unobservable Inputs (Level 3) |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |  |
Beginning Balance Liabilities |  |  | 1,095 | $ 6,142 | 6,142 | 6,651 |
Change in the estimated fair value of the contingent purchase price consideration |  |  | 132 |  | (5,047) | (509) |
Ending Balance Liabilities | $ 1,227 |  | $ 1,227 |  | $ 1,095 | $ 6,142 | $ 6,651

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- Definition Change in the fair value of contingent purchase price consideration. + References No definition available. + Details
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- Definition Fair value of contingent consideration in a business combination that is classified in shareholders' equity. + 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 (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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