Litigation - Summary of Activity in Asbestos Insurance Recoveries (Detail) (USD $) In Thousands, unless otherwise specified		6 Months Ended
Dec. 31, 2012	Jun. 30, 2013 Asbestos Claims [Member]	Jun. 30, 2012 Asbestos Claims [Member]
Loss Contingencies [Line Items]
Insurance receivable - asbestos, beginning of the year	$ 118,115	$ 118,115	$ 126,206
Settlement and defense costs paid by insurance carriers		(12,757)	(6,581)
Insurance receivable - asbestos, end of the period	$ 118,115	$ 105,358	$ 119,625

Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts.

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 210.5-02.17)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 17

-Article 5

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