Reconciliation of Beginning and Ending Balance for Liabilities Measured at Fair Value on Recurring Basis Unobservable Inputs (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)	[1]
Fair Value Disclosures [Abstract]
Beginning balances - Liabilities	$ 373
Total loss included in accumulated other comprehensive loss	71
Settlements included in interest expense	(444)
Ending balances - Liabilities	$ 0

[1] (1)The Company was previously party to an interest rate swap agreement, which expired in April 2016.