Employee Benefit Plans - Asset Allocation Ranges (Detail)	12 Months Ended
Dec. 31, 2013
Cash
Defined Benefit Plan Disclosure [Line Items]
Minimum %	0.00%
Maximum %	25.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Minimum %	0.00%
Maximum %	50.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Minimum %	50.00%
Maximum %	95.00%

Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920

Name:	us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration