Guarantor Disclosures (Additional Information) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Condensed Financial Statements, Captions [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	100.00%
3.60% Senior Notes Due 2022 [Member]
Condensed Financial Statements, Captions [Line Items]
Stated interest rate (percent)	3.60%
Maturity date	2022
Minimum debt amount guaranteed by subsidiaries	$ 5,000