Interest Rate Hedging - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 16, 2014	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Amount of interest rate swap	$ 150,000
Description of term of interest rate swap	On December 16, 2014, we entered into a $150,000 interest rate swap that will go into effect on December 29, 2015 (one year delayed start), at which time our interest rate will be locked at 7.216% until December 31, 2018.
Locked interest rate	7.216%
Derivative maturity date	Dec. 31, 2018
Derivative inception date	Dec. 29, 2015
Derivative in Net liability position		$ 3,475