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Stock-based Compensation and Outstanding Awards - Summary of Status of the Nonvested Shares (Parenthetical) (Detail)	6 Months Ended
	Jun. 30, 2015 shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares paid for tax withholding	63,209

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

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- Definition

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.

+ References

No definition available.

+ Details

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