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Summary of Cash Flows of Discontinued Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Discontinued Operations And Disposal Groups [Abstract]    
Cash flow from operating activities from discontinued operations $ 0 $ 7,673
Cash flow from investing activities from discontinued operations 0 5,900
Cash flow from financing activities from discontinued operations 0 (29,734)
Net change in cash and cash equivalents from discontinued operations 0 (16,161)
Cash and cash equivalents at beginning of period - discontinued operations 0 38,305
Cash and cash equivalents at end of period - discontinued operations $ 0 $ 22,144