Condensed Consolidating Financial Information - Guarantor Subsidiaries - Additional Information (Detail)	Dec. 31, 2016
Supplemental Guarantor Financial Information [Line Items]
Ownership percentage in domestic subsidiaries	100.00%
5.25% Senior Notes due March 15, 2019 [Member] \| Senior Notes [Member]
Supplemental Guarantor Financial Information [Line Items]
Interest rate on Senior Notes	5.25%

Contractual interest rate for funds borrowed, under the debt agreement.

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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant