Financing Activity - Applicable Credit Spread Over Libor at Various Leverage Levels (Detail) (London Interbank Offered Rate (LIBOR) [Member])	0 Months Ended	6 Months Ended				0 Months Ended	6 Months Ended
	Jan. 08, 2014 Wells Fargo Bank, NA and Capital One, NA [Member] Seven Year Term Loan [Member]	Jun. 30, 2014 Wells Fargo Bank, NA and Capital One, NA [Member] Ratio Four [Member] Seven Year Term Loan [Member]	Jun. 30, 2014 Wells Fargo Bank, NA and Capital One, NA [Member] Ratio Three [Member] Seven Year Term Loan [Member]	Jun. 30, 2014 Wells Fargo Bank, NA and Capital One, NA [Member] Ratio Two [Member] Seven Year Term Loan [Member]	Jun. 30, 2014 Wells Fargo Bank, NA and Capital One, NA [Member] Ratio One [Member] Seven Year Term Loan [Member]	Jan. 08, 2014 Wells Fargo Bank, NA and US Bank N [Member] Five Year Term Loan [Member]	Jun. 30, 2014 Wells Fargo Bank, NA and US Bank N [Member] Ratio Four [Member] Five Year Term Loan [Member]	Jun. 30, 2014 Wells Fargo Bank, NA and US Bank N [Member] Ratio Three [Member] Five Year Term Loan [Member]	Jun. 30, 2014 Wells Fargo Bank, NA and US Bank N [Member] Ratio Two [Member] Five Year Term Loan [Member]	Jun. 30, 2014 Wells Fargo Bank, NA and US Bank N [Member] Ratio One [Member] Five Year Term Loan [Member]	Jun. 30, 2014 Wells Fargo Bank , NA [Member] Ratio Four [Member] Revolving Credit Facility [Member]	Jun. 30, 2014 Wells Fargo Bank , NA [Member] Ratio Three [Member] Revolving Credit Facility [Member]	Jun. 30, 2014 Wells Fargo Bank , NA [Member] Ratio Two [Member] Revolving Credit Facility [Member]	Jun. 30, 2014 Wells Fargo Bank , NA [Member] Ratio One [Member] Revolving Credit Facility [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate	1.95%	2.35%	2.15%	1.95%	1.80%	1.45%	1.90%	1.60%	1.45%	1.35%	2.05%	1.85%	1.70%	1.50%