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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Operating Leased Assets [Line Items] |  |  |
Rent expense | $ 22.0 | $ 20.8 | $ 19.4
Renewal period of employment agreements | 1 year |  |
Minimum notice period | Dec. 31, 2015 |  |
Future compensation - 2014 | 18.1 |  |
Future compensation - 2015 through 2018 | $ 4.5 |  |
Executive Officer [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Number of officers with the company had employee agreement | 3 |  |
Maximum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating leases renewal period | 5 years |  |
Minimum [Member] |  |  |
Operating Leased Assets [Line Items] |  |  |
Operating leases renewal period | 1 year |  |

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- Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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