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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |
Aggregate amount of goodwill acquired | $ 237,300,000 |  |
Aggregate amount of impairment | 17,100,000 |  |
Goodwill | 220,163,000 | $ 165,861,000 | $ 129,888,000
Intangible assets – indefinite life | 26,337,000 | 19,766,000 | 18,419,000
Impairment of intangible assets | 3,340,000 |  |
Goodwill or indefinite life intangible asset charges |  | 0 | 0
Amortization expense of finite life intangible assets | 12,300,000 | $ 7,600,000 | $ 4,700,000
Amortization expense of finite life intangibles for 2016 | 14,000,000 |  |
Amortization expense of finite life intangibles for 2017 | 11,600,000 |  |
Amortization expense of finite life intangibles for 2018 | 10,000,000 |  |
Amortization expense of finite life intangibles for 2019 | 8,900,000 |  |
Amortization expense of finite life intangibles for 2020 | 7,100,000 |  |
Reporting Unit One [Member] |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |
Goodwill impairment charges | 0 |  |
Goodwill | $ 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% |  |
Three Reporting Units [Member] |  |  |
Schedule Of Goodwill And Other Intangible Assets [Line Items] |  |  |
Intangible assets – indefinite life | $ 10,000,000 |  |
Fair value lower than the aggregate carrying value | 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=56944662&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=26713463&loc=d3e16323-109275 + Details
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