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Noncontrolling interest - Summary of Activity of Noncontrolling Interest-Redeemable (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Noncontrolling interest-redeemable, Beginning balance	$ 11,517
Net income attributable to noncontrolling interest-redeemable	1,610
Noncontrolling interest-redeemable distributions	(1,830)
Noncontrolling interest-redeemable, Ending balance	$ 11,297

As of the reporting date, the aggregate carrying amount of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity.

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