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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |
Amortization expense of finite life intangible assets | $ 3,500,000 |  | $ 3,300,000 | $ 11,123,000 | $ 8,513,000 |  |
Goodwill | 224,531,000 | $ 220,163,000 |  | 224,531,000 |  | $ 220,163,000 | $ 165,861,000
Intangible assets-indefinite life | 26,393,000 | 26,337,000 |  | 26,393,000 |  | 26,337,000 | $ 19,766,000
Impairment of intangible assets |  |  |  |  |  | 3,340,000 |
Goodwill or indefinite life intangible asset charges | 0 |  |  | 0 |  |  |
Reporting Unit One [Member] |  |  |  |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill impairment charges |  |  |  |  |  | 0 |
Goodwill | 77,900,000 | 77,900,000 |  | 77,900,000 |  | $ 77,900,000 |
Estimated fair value of goodwill exceeds from its carrying value |  |  |  |  |  | 8.00% |
Decrease in projected revenue growth rate |  |  |  |  |  | 1.10% |
Decrease in projected operational profit |  |  |  |  |  | 3.90% |
Reporting Unit One [Member] | Tradename [Member] |  |  |  |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets-indefinite life | $ 5,000,000 |  |  | $ 5,000,000 |  |  |
Three Reporting Units [Member] |  |  |  |  |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |  |  |  |  |
Intangible assets-indefinite life |  | $ 10,000,000 |  |  |  | $ 10,000,000 |
Fair value lower than the aggregate carrying value |  | 33.40% |  |  |  | 33.40% |
Impairment of intangible assets |  | $ 3,300,000 |  |  |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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