Hedging Activities - Effect of Derivative Hedges on Consolidated Statements of Income and Consolidated Statements of Comprehensive Income (Loss) (Detail) - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in OCL on Derivatives (Effective Portion)	$ 12,498
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Reclassified from AOCL into Income (Effective Portion)	(544)
Amount of Gain Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 1,130