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Organization and Basis of Presentation - Schedule of Adjustments to Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income (loss) from operations before income taxes	$ 133,194	$ 57,794
Consolidated net income (loss)	97,431	51,116	$ 81,729
Net income (loss) attributable to noncontrolling interest in subsidiaries	38,657	14,291
Net income (loss) available to common stockholders	$ 58,774	$ 36,825
Basic earnings (loss) per share	$ 0.19	$ 0.13
Diluted earnings (loss) per share	$ 0.19	$ 0.13
As Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income (loss) from operations before income taxes		$ 28,751
Consolidated net income (loss)		22,092
Net income (loss) attributable to noncontrolling interest in subsidiaries		3,877
Net income (loss) available to common stockholders		$ 18,215
Basic earnings (loss) per share		$ 0.06
Diluted earnings (loss) per share		$ 0.06
Retrospective Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Income (loss) from operations before income taxes		$ 29,043
Consolidated net income (loss)		29,024
Net income (loss) attributable to noncontrolling interest in subsidiaries		10,414
Net income (loss) available to common stockholders		$ 18,610
Basic earnings (loss) per share		$ 0.07
Diluted earnings (loss) per share		$ 0.07

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