Subsequent Events - Additional Information (Detail)		1 Months Ended
	Oct. 14, 2016 USD ($) line_of_credit	Nov. 04, 2016 USD ($) store	Sep. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Subsequent Event [Line Items]
Amount drawn			$ 166,000,000	$ 36,000,000
Subsequent Event [Member] | Line of Credit [Member]
Subsequent Event [Line Items]
Credit facility amount	$ 1,150,000,000
Number of lines of credit terminated | line_of_credit	3
Number of lines of credit | line_of_credit	4
Subsequent Event [Member] | Line of Credit [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Credit facility amount	$ 500,000,000
Subsequent Event [Member] | Line of Credit [Member] | Five- Year Term Loan [Member]
Subsequent Event [Line Items]
Credit facility amount	430,000,000
Amount drawn	$ 300,000,000
Loan term	5 years
Subsequent Event [Member] | Line of Credit [Member] | Seven-Year Term Loan [Member]
Subsequent Event [Line Items]
Credit facility amount	$ 220,000,000
Loan term	7 years
Subsequent Event [Member] | Eight stores in California, Maryland, Minnesota, Texas and Utah [Member]
Subsequent Event [Line Items]
Number of operating stores acquired | store		8
Total purchase price		$ 73,850,000