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Goodwill and Other Intangible Assets - Schedule of Activity in Goodwill and Intangible Assets, Net (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Intangible assets, net, beginning of period | $ 44,633 us-gaap_IntangibleAssetsNetExcludingGoodwill | $ 48,711 us-gaap_IntangibleAssetsNetExcludingGoodwill | $ 52,096 us-gaap_IntangibleAssetsNetExcludingGoodwill
Acquisition | 1,075 us-gaap_IndefinitelivedIntangibleAssetsAcquired | 356 us-gaap_IndefinitelivedIntangibleAssetsAcquired | 560 us-gaap_IndefinitelivedIntangibleAssetsAcquired
Amortization expense | (3,925)us-gaap_AmortizationOfIntangibleAssets | (4,434)us-gaap_AmortizationOfIntangibleAssets | (3,945)us-gaap_AmortizationOfIntangibleAssets
Intangible assets, net, end of period | 41,783 us-gaap_IntangibleAssetsNetExcludingGoodwill | 44,633 us-gaap_IntangibleAssetsNetExcludingGoodwill | 48,711 us-gaap_IntangibleAssetsNetExcludingGoodwill
Goodwill | 5,260 us-gaap_Goodwill | 5,260 us-gaap_Goodwill | 4,795 us-gaap_Goodwill
Acquisition | 0 us-gaap_GoodwillAcquiredDuringPeriod |  | 465 us-gaap_GoodwillAcquiredDuringPeriod
Goodwill | $ 5,260 us-gaap_Goodwill | $ 5,260 us-gaap_Goodwill | $ 5,260 us-gaap_Goodwill

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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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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 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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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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Balance Type: | debit
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Details
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- Definition Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, resulting from a business combination. + References No definition available. + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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