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Acquisitions - Additional Information (Detail) - USD ($) $ in Thousands |  | 9 Months Ended |
--- | --- | --- | ---
Mar. 17, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | May. 30, 2014
Business Acquisition [Line Items] |  |  |  |
Payments to acquire business, net of cash acquired |  | $ 9,910 | $ 86,950 |
Precisive, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Payments to acquire business, net of cash acquired | $ 12,085 |  |  |
Business acquisition, ownership percentage | 100.00% |  |  |
Business acquisition, cash acquired | $ 435 |  |  |
Business acquisition, deferred consideration payment | $ 2,600 |  |  |
Business acquisition, deferred consideration payment period | 15 months |  |  |
Business combination consideration price | $ 12,520 |  |  |
Granville-Phillips [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business combination consideration price |  |  |  | $ 86,950

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