Revolving Term Credit Facilities and Debt - Additional Information - Equipment (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2015 USD ($) Lease
Capital Lease Equipment [Member]
Credit Facilities [Line Items]
Maximum borrowing capacity of new equipment	100.00%
Maximum borrowing capacity of used equipment	75.00%
Lease repayment period of new equipment	60 months
Lease repayment period of used equipment	36 months
Capital leases purchase price of leased asset at option of lessee	$ 1
Other Capital Lease [Member]
Credit Facilities [Line Items]
Additional small capital lease \| Lease	2
Outstanding capital lease obligation	$ 47

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Name:	us-gaap_CapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant