Consolidated Statements of Redeemable Noncontrolling Interest and Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Statement Of Stockholders Equity [Abstract] | ||
| Common stock issued, per share | $ 215.00 | $ 242 |
| Common stock secondary public offering issuance costs | $ 14,595 | $ 11,122 |