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Noncontrolling interest - Summary of Activity of Noncontrolling Interest-Redeemable (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]  
Noncontrolling interest-redeemable, Beginning balance $ 11,258
Net income attributable to noncontrolling interest-redeemable 3,792
Noncontrolling interest-redeemable distributions (4,182)
Sale of noncontrolling interest 32
Purchase of noncontrolling interest 101
Noncontrolling interest-redeemable, Ending balance $ 11,001