Supplementary Information - Condensed Consolidating Financial Information - Additional Information (Detail)	12 Months Ended
Dec. 31, 2015
Parent Guarantor [Member]
Parent Company Only Financial Information [Line Items]
Ownership interest percentage in subsidiary	100.00%

The number of units or percentage investment held in the subsidiary by the limited liability company or limited partnership.

No definition available.

Name:	us-gaap_SubsidiaryOfLimitedLiabilityCompanyOrLimitedPartnershipOwnershipInterest
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration