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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated salvage value | 70.00% |  |
Capitalized software development costs, net of accumulated amortization | $ 15,855,000 | $ 13,469,000 |
Capitalized computer software, amortization | 7,200,000 | 5,200,000 | $ 5,500,000
Additions to capitalized software development costs | 9,600,000 | 8,400,000 | 5,400,000
Long-term purchase commitment amount | $ 127,500,000 | 136,400,000 |
Variance below minimum VSOE rate | 10.00% |  |
Advertising costs | $ 500,000 | 3,000,000 | 1,900,000
Common stock, conversion ratio | One |  |
Cumulative foreign currency translation amount | $ (7,400,000) | (4,400,000) | (800,000)
Reclassification of foreign currency translation adjustment from other comprehensive income | (280,000) | 0 | 0
Foreign currency translation adjustments, tax | 0 | 0 | 0
Transaction gains (losses) arising from transactions denominated in foreign currencies | $ 2,400,000 | $ 5,300,000 | $ (3,300,000)
Class A |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Common stock, voting rights, per share | One |  |
Class B Convertible |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Common stock, voting rights, per share | Ten |  |
Computer Equipment And Purchased Software |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets, years | 3 years |  |
Office Equipment And Automobiles |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets, years | 5 years |  |
Office Furniture And Corporate Aircraft |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets, years | 10 years |  |
Software Development |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets, years | 3 years |  |

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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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