Stock Repurchase Program - Additional Information (Detail) (USD $) Share data in Thousands, unless otherwise specified	0 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 19, 2013	Dec. 31, 2007	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2008
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program	$ 23,100,000	$ 5,000,000					$ 16,100,000
Additional authorized amount stock repurchase program	7,000,000
Stock repurchase program expiration date					Sep. 20, 2013
Repurchase of common stock			0	201	0	365
Aggregate purchase price common stock				$ 852,000	$ 0	$ 1,513,000
Prior Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program expiration date					Sep. 19, 2014