Schedule of Calculation of Numerator and Denominator in Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common stockholders, Basic	$ 26,717			$ 48,994			$ 80,960	$ 146,912
Net income attributable to common stockholders, Diluted	26,717			48,994			80,960	146,912
Net income attributable to non-controlling interest, Diluted							1,181
Diluted net income attributable to common stockholders	$ 26,717	$ 22,186	$ 33,238	$ 48,994	$ 48,578	$ 49,340	$ 82,141	$ 146,912
Weighted average common shares outstanding, Basic	119,632			119,096			119,533	119,028
Weighted average common shares outstanding, Basic	119,632			119,096			119,533	119,028
Non-controlling interest – Operating Partnership Units	1,342						1,342
Weighted average shares and assumed conversions	120,980			119,189			120,900	119,162
BASIC EARNINGS PER SHARE	$ 0.22			$ 0.41			$ 0.68	$ 1.23
DILUTED EARNINGS PER SHARE	$ 0.22			$ 0.41			$ 0.68	$ 1.23
Stock options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities				3				30
Restricted stock based awards
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Effect of dilutive securities	6			90			25	104