Equity (Detail) (USD $)	0 Months Ended
	Apr. 21, 2015	Aug. 27, 2015	Apr. 24, 2015	Apr. 06, 2015	Feb. 27, 2015	Mar. 31, 2015	Dec. 31, 2014	Apr. 02, 2015	Apr. 01, 2015
Subsidiary, Sale of Stock [Line Items]
Common stock, shares authorized						80,000,000	80,000,000
Subsequent Event | FOLLOW-ON PUBLIC OFFERING
Subsidiary, Sale of Stock [Line Items]
Direct offering costs	$ 1,600,000
Net proceeds received	187,100,000
Net proceeds used to fund a portion of working capital expenditures	102,100,000
Scenario, Forecast | Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Quarterly dividend per share		$ 1.80
Revolving Credit Facility | Subsequent Event | FOLLOW-ON PUBLIC OFFERING
Subsidiary, Sale of Stock [Line Items]
Repayments of outstanding borrowings			85,000,000
HEYCO
Subsidiary, Sale of Stock [Line Items]
Shares of common stock converted for each share of Series A Preferred Stock					10
Series A Preferred Stock
Subsidiary, Sale of Stock [Line Items]
Number of votes					10
Common Stock | Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Preferred stock converted to shares common stock				1,500,000
Common stock, shares authorized								120,000,000	80,000,000
Common Stock | Subsequent Event | FOLLOW-ON PUBLIC OFFERING
Subsidiary, Sale of Stock [Line Items]
Shares of common stock included in offering	7,000,000
Common Stock | HEYCO
Subsidiary, Sale of Stock [Line Items]
Shares issued in business combination					3,300,000
Preferred Stock | HEYCO
Subsidiary, Sale of Stock [Line Items]
Shares issued in business combination					$ 150,000