Stockholders' Equity - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class Of Stock [Line Items]
Treasury stock, shares	3,470,084	3,428,541
Shares purchased during period	43,835	41,915	60,595
Treasury stock distributed under deferred compensation plan	7,587
Stock purchased to settle employees statutory withholding taxes relates to performance stock awards and deferred compensation distribution	5,295
Open Market Repurchases [Member]
Class Of Stock [Line Items]
Shares purchased during period	43,835