Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Equity Attributable to Non-controlling Interests (Detail)

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Stockholders' Equity - Equity Attributable to Non-controlling Interests (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Noncontrolling Interest [Abstract]        
Non-controlling interests, beginning of period     $ 81,881 $ 48,178
Net earnings $ 14,520 $ 11,432 41,025 33,361
Foreign currency translation adjustment     3,288 (812)
Capital contributions     46 5,707
Capital distributions     (9,347) (7,945)
Non-controlling interests, end of period $ 116,893 $ 78,489 $ 116,893 $ 78,489