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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2011
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Total deferred rent obligation | $ 0.3 |  | $ 0.3 |  | $ 0.3 | $ 0.5
Rent expense of office facilities and real estate | 2.0 | 1.9 | 4.0 | 3.9 | 7.8 | 7.9
Rent expense for telecommunications and other equipment | 1.8 | 1.9 | 3.5 | 3.7 | 7.1 | 7.7
Outstanding letter of credit |  |  |  |  | $ 0.7 |
Maximum |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |
Outstanding letter of credit, maturity term |  |  |  |  | 3 months |

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- Details
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Data Type: | xbrli:stringItemType
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- Definition Letters of Credit Obligation Period + References No definition available. + Details
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- Definition Rent expense for office facilities and real estate. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Rent expense for telecommunications and other equipment. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | instant