Organization, Business and Summary of Significant Accounting Policies (Company's Derivative Instruments of Interest Rate Swaps) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Interest Rate Swap One [Member]
Derivative [Line Items]
Date entered	2011-12
Notional amount	$ 175,000
Fixed interest rate paid	1.60%	[1]
Decription of variable rate basis	1-month LIBOR
Effective date	2014-02
Expiration date	2017-02
Interest Rate Swap Two [Member]
Derivative [Line Items]
Date entered	2014-04
Notional amount	$ 100,000
Fixed interest rate paid	1.80%	[1]
Decription of variable rate basis	1-month LIBOR
Effective date	2014-07
Expiration date	2019-07
Interest Rate Swap Three [Member]
Derivative [Line Items]
Date entered	2014-05
Notional amount	$ 50,000
Fixed interest rate paid	2.344%	[1]
Decription of variable rate basis	1-month LIBOR
Effective date	2015-10
Expiration date	2020-10
Interest Rate Swap Four [Member]
Derivative [Line Items]
Date entered	2014-05
Notional amount	$ 25,000
Fixed interest rate paid	2.326%	[1]
Decription of variable rate basis	1-month LIBOR
Effective date	2015-10
Expiration date	2020-10
Interest Rate Swap Five [Member]
Derivative [Line Items]
Date entered	2014-05
Notional amount	$ 50,000
Fixed interest rate paid	2.35%	[1]
Decription of variable rate basis	1-month LIBOR
Effective date	2015-10
Expiration date	2020-10
Interest Rate Swap Six [Member]
Derivative [Line Items]
Date entered	2014-05
Notional amount	$ 50,000
Fixed interest rate paid	2.35%	[1]
Decription of variable rate basis	1-month LIBOR
Effective date	2015-10
Expiration date	2020-10
Interest Rate Swap Seven [Member]
Derivative [Line Items]
Date entered	2016-04
Notional amount	$ 100,000
Fixed interest rate paid	1.00%	[1]
Decription of variable rate basis	1-month LIBOR
Effective date	2017-02
Expiration date	2020-02
Interest Rate Swap Eight [Member]
Derivative [Line Items]
Date entered	2016-06
Notional amount	$ 75,000
Fixed interest rate paid	0.85%	[1]
Decription of variable rate basis	1-month LIBOR
Effective date	2017-02
Expiration date	2020-02
Interest Rate Swap Nine [Member]
Derivative [Line Items]
Date entered	2016-06
Notional amount	$ 150,000
Fixed interest rate paid	0.95%	[1]
Decription of variable rate basis	1-month LIBOR
Effective date	2018-01
Expiration date	2021-01
Interest Rate Swap Ten [Member]
Derivative [Line Items]
Date entered	2016-06
Notional amount	$ 150,000
Fixed interest rate paid	0.95%	[1]
Decription of variable rate basis	1-month LIBOR
Effective date	2018-01
Expiration date	2021-01
Interest Rate Swap Eleven [Member]
Derivative [Line Items]
Date entered	2016-07
Notional amount	$ 50,000
Fixed interest rate paid	0.90%	[1]
Decription of variable rate basis	1-month LIBOR
Effective date	2018-01
Expiration date	2021-01
Interest Rate Swap Twelve [Member]
Derivative [Line Items]
Date entered	2016-07
Notional amount	$ 50,000
Fixed interest rate paid	0.89%	[1]
Decription of variable rate basis	1-month LIBOR
Effective date	2018-01
Expiration date	2021-01

[1] Plus applicable margin.