Fair Value Measurements - Additional Information (Detail) (USD $)	6 Months Ended
Jun. 30, 2014
Fair Value Disclosures [Abstract]
Transfers between fair value measurements levels	$ 0

Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy.

No definition available.

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration