Sale-Leaseback Arrangements - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
Dec. 31, 2010	Dec. 31, 2015	Dec. 31, 2014
Sale Leaseback Transaction [Line Items]
Master leaseback arrangement term	15 years	10 years
Value of assets sold to investor under leaseback arrangement	$ 25,200,000
Cost of assets contributed to subsidiary		$ 44,600,000	$ 44,600,000
Sales-leaseback arrangements, amounts due to investors		$ 0
Sale-leaseback Arrangement [Member]
Sale Leaseback Transaction [Line Items]
Restricted cash	$ 250,000

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_RestrictedCashAndCashEquivalents
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant