Receivables Securitization - Additional information (Detail)	6 Months Ended
Jun. 30, 2018 USD ($)
Accounts Receivable [Line Items]
Trade receivables	$ 38,800,000
Collective limit under factoring arrangements	74,000,000
Factored receivables yet not collected	23,100,000
Other Nonoperating (Expense) Income [Member]
Accounts Receivable [Line Items]
Factoring fees	$ 200,000

Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

Name:	us-gaap_ProceedsFromAccountsReceivableSecuritization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration