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Commitments and Contingencies - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) Customer | Dec. 31, 2014 USD ($) Customer | Dec. 31, 2013 USD ($)
Commitments And Contingencies Disclosure [Line Items] |  |  |
Lease expense | $ 4.5 | $ 4.1 | $ 4.9
Asset capitalized under capital lease | 13.2 | $ 12.7 |
Unconditional purchase commitments | 35.9 |  |
Unconditional purchase commitments, 2016 | 34.1 |  |
Unconditional purchase commitments, 2017 | 1.5 |  |
Unconditional purchase commitments, 2018 | $ 0.3 |  |
Number of customer accounted on accounts receivable balance | Customer | 1 |  |
Number of customers accounted for 10% or more of accounts receivable | Customer | 0 | 0 |
Minimum |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Lease agreement expiration year | 2017 |  |
Maximum |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Lease agreement expiration year | 2019 |  |
Land | Maximum |  |  |
Commitments And Contingencies Disclosure [Line Items] |  |  |
Lease agreement expiration year | 2078 |  |

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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455314&loc=d3e45014-112735 + Details
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- Definition Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308 + Details
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