Defined Benefit Pension Obligation - Additional Information (Detail) (USD $)	9 Months Ended
Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to pension plan in 2014	$ 942,000

Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period.

No definition available.

Name:	us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration