Accumulated Other Comprehensive Loss - Additional Information (Detail) $ in Thousands	6 Months Ended
Jun. 30, 2015 USD ($)
Accumulated Other Comprehensive Loss [Abstract]
Amortization to be reclassified from OCI into income	$ 460

The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

No definition available.

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