Stock Based Compensation Plans - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Excess tax benefit	$ 1,300,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares received for withholding taxes	12,008
Equity awards vested	41,000
Minimum withholding tax	$ 148,000

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

No definition available.

Name:	us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration