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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands, ¥ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 05, 2018
USD ($)
Sep. 25, 2017
USD ($)
Feb. 27, 2012
USD ($)
Feb. 27, 2012
CNY (¥)
Oct. 08, 2011
USD ($)
Oct. 08, 2011
CNY (¥)
Sep. 13, 2011
USD ($)
Sep. 13, 2011
CNY (¥)
Mar. 31, 2011
USD ($)
Mar. 31, 2011
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Commitments And Contingencies [Line Items]                              
Restricted cash included in long-term assets                     $ 165   $ 165   $ 165
Gain on sale of minority interest                     $ 0 $ 325 $ 951 $ 325  
Infinia Technology Corporation (ITC)                              
Commitments And Contingencies [Line Items]                              
Consideration transferred, excluding contingent consideration   $ 3,800                          
Business combination, cash paid   $ 100                          
Subsequent event | Infinia Technology Corporation (ITC)                              
Commitments And Contingencies [Line Items]                              
Make whole payment $ 700                            
Sinovel Wind Group Co. Ltd.                              
Commitments And Contingencies [Line Items]                              
Sought compensation amount     $ 16,000 ¥ 105 $ 184,000 ¥ 1,200 $ 75,000 ¥ 485              
Value of the undelivered components                 $ 707,000 ¥ 4,600