Summary of the Gross and Net Presentation of Amounts Related to the Derivative Financial Instruments (Detail) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Interest Rate Swap Agreement One
Derivative [Line Items]
Notional amount of derivative contract	[1]	$ 12,050	$ 12,248
Amounts of asset (liability) presented in the accompanying condensed consolidated balance sheet, Gross amount		(44)	(85)
Fair value asset (liability)		(44)	(85)
Interest Rate Swap Agreement Two
Derivative [Line Items]
Notional amount of derivative contract	[1]	37,446	38,052
Amounts of asset (liability) presented in the accompanying condensed consolidated balance sheet, Gross amount		(878)	(1,472)
Fair value asset (liability)		(878)	(1,472)
Interest Rate Swap Agreement Three
Derivative [Line Items]
Notional amount of derivative contract	[1]	25,516	25,929
Amounts of asset (liability) presented in the accompanying condensed consolidated balance sheet, Gross amount		(667)	(1,086)
Fair value asset (liability)		(667)	(1,086)
Interest Rate Swap Agreement Four
Derivative [Line Items]
Notional amount of derivative contract	[2]	10,422	10,699
Amounts of asset (liability) presented in the accompanying condensed consolidated balance sheet, Gross amount			1
Fair value asset (liability)			1
Interest Rate Swap Agreement Five
Derivative [Line Items]
Notional amount of derivative contract	[1]	47,983	48,415
Amounts of asset (liability) presented in the accompanying condensed consolidated balance sheet, Gross amount		(949)	(1,066)
Fair value asset (liability)		(949)	(1,066)
Interest Rate Swap Six Agreement
Derivative [Line Items]
Notional amount of derivative contract	[1]	82,370	83,797
Amounts of asset (liability) presented in the accompanying condensed consolidated balance sheet, Gross amount		(1,512)	(2,283)
Fair value asset (liability)		(1,512)	(2,283)
Interest Rate Swap Seven Agreement
Derivative [Line Items]
Notional amount of derivative contract	[1]	6,876	6,998
Amounts of asset (liability) presented in the accompanying condensed consolidated balance sheet, Gross amount		(17)	(37)
Fair value asset (liability)		(17)	(37)
Interest Rate Swap Eight Agreement
Derivative [Line Items]
Notional amount of derivative contract	[1]	175,000	175,000
Amounts of asset (liability) presented in the accompanying condensed consolidated balance sheet, Gross amount		(992)	(1,694)
Fair value asset (liability)		(992)	(1,694)
Interest Rate Swap Nine Agreement
Derivative [Line Items]
Notional amount of derivative contract	[1]	134,258	138,698
Amounts of asset (liability) presented in the accompanying condensed consolidated balance sheet, Gross amount		(976)	(1,795)
Fair value asset (liability)		(976)	(1,795)
Interest Rate Swap Ten Agreement
Derivative [Line Items]
Notional amount of derivative contract	[2]	260,000	260,000
Amounts of asset (liability) presented in the accompanying condensed consolidated balance sheet, Gross amount		600	1,988
Fair value asset (liability)		600	$ 1,988
Interest Rate Swap Eleven Agreement
Derivative [Line Items]
Notional amount of derivative contract	[2]	150,000
Amounts of asset (liability) presented in the accompanying condensed consolidated balance sheet, Gross amount		346
Fair value asset (liability)		$ 346

[1] Amounts related to interest rate swaps held by the Company, or its equity method investments, which are recorded at fair value and included in either other assets or other liabilities in the accompanying consolidated balance sheets.

[2] Amounts related to the interest rate caps held by the Company, or its equity method investments, which are recorded at fair value and included in other assets in the accompanying consolidated balance sheets.