XML 14 R54.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Retirement Plan - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Compensation and Retirement Disclosure [Abstract] |  |
Retirement plan contribution by company | $ 2.6 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 2.7 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

X
- Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration