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Stockholders' Equity - Additional Information (Detail) - USD ($)						3 Months Ended		6 Months Ended
	Jul. 16, 2015	Jun. 09, 2015	Apr. 28, 2015	Mar. 27, 2015	Feb. 20, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Nov. 04, 2014	Apr. 22, 2014
Subsequent Event [Line Items]
Cash dividends declared per common share (usd per share)			$ 0.06		$ 0.06	$ 0.06	$ 0.03	$ 0.12	$ 0.03
Payments of common stock dividends		$ 3,700,000		$ 3,800,000				$ 7,500,000	$ 1,900,000
Authorized amount										$ 75,000,000	$ 15,000,000
Shares acquired						96,725		330,362
Payments for repurchase of common stock						$ 1,400,000		$ 5,000,000	$ 3,300,000
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared per common share (usd per share)	$ 0.06
April 2014 Repurchase Program
Subsequent Event [Line Items]
Payments for repurchase of common stock						$ 15,000,000

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Aggregate dividends declared during the period for each share of common stock outstanding.

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