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Fair Value Measurements - Change in Redeemable Noncontrolling Interests (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Change in Redeemable Noncontrolling Interests [Roll Forward]      
Balance, beginning of period $ 28,885 $ 26,564 $ 0
Initial redeemable noncontrolling interest related to business combinations 9,409 4,997 25,517
Net income (loss) attributable to redeemable noncontrolling interests 1,371 (4,513) (1,167)
Adjustment of the redeemable noncontrolling interests to fair value 2,349 5,730 1,167
Effect of foreign currency translation attributable to redeemable noncontrolling interests (3,390) (3,893) 1,047
Balance, end of period $ 38,624 $ 28,885 $ 26,564