Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Millions		6 Months Ended	12 Months Ended
	Oct. 22, 2015	Jun. 30, 2016	Dec. 31, 2015	Oct. 23, 2014
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, termination date	Oct. 22, 2015
Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized shares				2,000,000
October 2014 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased by the Company			1,134,300
Value of shares repurchased by the Company			$ 45.2
October 2015 Stock Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased by the Company		1,578,952
Value of shares repurchased by the Company		$ 53.3
Common stock repurchase program, termination date	Dec. 31, 2016
October 2015 Stock Repurchase Program | Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized shares	3,150,000