Fair Value Measurements - Schedule of Effect of Company Interest Rate Swaps in Consolidated Statement of Comprehensive Income (Detail) - Cash Flow Hedging [Member] - Interest Rate Swap [Member] - Interest Expense - Net [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gain Recognized in Other Comprehensive Loss, net of tax	$ 1,888	$ 1,888
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss to Income, net of tax	$ 557	$ 557