Stock Repurchase Program - Additional Information (Detail) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 17, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2008	Dec. 31, 2007
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program						$ 23,100,000	$ 5,000,000
Stock repurchase program expiration date						Sep. 19, 2015
Repurchase of common stock		0	16,000	0	16,000
Aggregate purchase price common stock			$ 114,000		$ 114,000
Prior Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program expiration date	Sep. 23, 2016