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Organization and Basis of Presentation - Summary of Acquisition Impact in Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Income before income taxes and noncontrolling interests | $ 39,420 | $ 36,992 |
Net income | 32,487 | 37,007 | $ 145,096
Net income attributable to noncontrolling interests | 12,490 | 296 |
Net income available to common stockholders | $ 19,997 | 36,711 |
BPF [Member] |  |  |
Income before income taxes and noncontrolling interests |  | 36,992 |
Net income |  | 37,007 |
Net income attributable to noncontrolling interests |  | 296 |
Net income available to common stockholders |  | 36,711 |
BPF [Member] | As Previously Reported [Member] |  |  |
Income before income taxes and noncontrolling interests |  | 7,946 |
Net income |  | 7,980 |
Net income attributable to noncontrolling interests |  | 296 |
Net income available to common stockholders |  | 7,684 |
BPF [Member] | Retrospective Adjustments [Member] |  |  |
Income before income taxes and noncontrolling interests |  | 29,046 |
Net income |  | 29,027 |
Net income available to common stockholders |  | $ 29,027 |

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