Financing Activity - Applicable Credit Spread Over Libor at Various Leverage Levels (Detail)	0 Months Ended	3 Months Ended
	Jan. 08, 2014	Mar. 31, 2015
Two Thousand Fourteen Term Loans [Member] | Minimum [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Capitalization Rates	6.50%
Two Thousand Fourteen Term Loans [Member] | Maximum [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Capitalization Rates	7.50%
2013 Revolving Credit Facility [Member] | Minimum [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Capitalization Rates		6.50%
2013 Revolving Credit Facility [Member] | Maximum [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Capitalization Rates		7.50%
Wells Fargo Bank, NA and Capital One, NA [Member] | Ratio Four [Member] | London Interbank Offered Rate (LIBOR) [Member] | Seven Year Term Loan [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate	2.35%
Wells Fargo Bank, NA and Capital One, NA [Member] | Ratio Three [Member] | London Interbank Offered Rate (LIBOR) [Member] | Seven Year Term Loan [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate	2.15%
Wells Fargo Bank, NA and Capital One, NA [Member] | Ratio Two [Member] | London Interbank Offered Rate (LIBOR) [Member] | Seven Year Term Loan [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate	1.95%
Wells Fargo Bank, NA and Capital One, NA [Member] | Ratio One [Member] | London Interbank Offered Rate (LIBOR) [Member] | Seven Year Term Loan [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate	1.80%
Wells Fargo Bank, NA and US Bank N [Member] | Ratio Four [Member] | London Interbank Offered Rate (LIBOR) [Member] | Five Year Term Loan [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate	1.90%
Wells Fargo Bank, NA and US Bank N [Member] | Ratio Three [Member] | London Interbank Offered Rate (LIBOR) [Member] | Five Year Term Loan [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate	1.60%
Wells Fargo Bank, NA and US Bank N [Member] | Ratio Two [Member] | London Interbank Offered Rate (LIBOR) [Member] | Five Year Term Loan [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate	1.45%
Wells Fargo Bank, NA and US Bank N [Member] | Ratio One [Member] | London Interbank Offered Rate (LIBOR) [Member] | Five Year Term Loan [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate	1.35%
Wells Fargo Bank , NA [Member] | Ratio Four [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate		2.05%
Wells Fargo Bank , NA [Member] | Ratio Three [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate		1.85%
Wells Fargo Bank , NA [Member] | Ratio Two [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate		1.70%
Wells Fargo Bank , NA [Member] | Ratio One [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member]
Schedule Of Maximum Leverage Ratio [Line Items]
Stated Interest Rate		1.50%