Related Party Transactions - Additional Information (Detail) (USD $)
|
3 Months Ended | 12 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2013
|
Dec. 31, 2014
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Dec. 31, 2013
|
Dec. 31, 2012
|
|
Related Party Transaction [Line Items] | ||||
Business related travel expense | $ 1,800,000 | $ 2,700,000 | $ 4,200,000 | |
Payment of fee for modification of agreement relating to business usage of airplane | 1,500,000 | |||
Maximum [Member] | ||||
Related Party Transaction [Line Items] | ||||
Maximum future annual reimbursements | 2,500,000 | |||
Affiliated Entity [Member] | ||||
Related Party Transaction [Line Items] | ||||
Fee for services | 2,300,000 | 772,000 | ||
Sublease income | 76,000 | |||
Affiliated Entity [Member] | Maximum [Member] | Scenario, Forecast [Member] | ||||
Related Party Transaction [Line Items] | ||||
Fee for services | $ 416,000 | $ 19,200,000 |