Stock-Based Compensation Plans - Additional Information (Detail)	6 Months Ended	3 Months Ended
Jun. 30, 2014 Stock Appreciation Rights (SARs)	Jun. 30, 2014 Stock Appreciation Rights (SARs) Maximum	Mar. 31, 2014 Performance Share Unit (PSU)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years		3 years
Expiration term of stock units		5 years

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration