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Earnings Per Share - Reconciles Numerator and Denominator of Basic and Diluted Earnings Per Share Computations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator for EPS:
Net income	$ 36,396	$ 9,964	$ 29,376	$ 31,199	$ 13,655	$ 26,882	$ 33,647	$ 25,226	$ 106,935	$ 99,410	$ 106,484
Less: Preferred stock dividends									(10)	(10)	(10)
Income available to common stockholders									$ 106,925	$ 99,400	$ 106,474
Denominator for EPS:
Weighted average common shares outstanding									34,841	34,919	34,799
Plus: Assumed conversion of share-based compensation									943	706	1,056
Assumed conversion of preferred stock									25	25	29
Weighted average diluted common shares outstanding									35,809	35,650	35,884
Basic earnings per common share	$ 1.05	$ 0.29	$ 0.84	$ 0.89	$ 0.39	$ 0.77	$ 0.96	$ 0.73	$ 3.07	$ 2.85	$ 3.06
Diluted earnings per common share	$ 1.03	$ 0.28	$ 0.82	$ 0.86	$ 0.38	$ 0.75	$ 0.94	$ 0.71	$ 2.99	$ 2.79	$ 2.97
Weighted average number of antidilutive shares									1,504	1,583	311

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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