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Reconciliation of Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 12,035	$ 15,364
Weighted average shares outstanding - basic	36,661	36,855
Dilutive effect of stock options and restricted stock	63	94
Weighted average shares outstanding - diluted	36,724	36,949
Earnings per share - basic	$ 0.33	$ 0.42
Earnings per share - diluted	$ 0.33	$ 0.42

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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